The percentage of her phone bills are between 32 and 98 will be 99.73%.
What is the z-score?The z-score is a statistical evaluation of a value's correlation to the mean of a collection of values, expressed in terms of standard deviation.
The z-score is given as
z = (x – μ) / σ
Where μ is the mean, σ is the standard deviation, and x is the sample.
The amount of Jen's monthly phone bill is normally distributed with a mean of $65 and a standard deviation of 11.
Then the percentage of her phone bills are between 32 and 98 will be
The value of z-score for x = 32, we have
z = (32 – 65) / 11
z = –3
The value of z-score for x = 98, we have
z = (98 – 65) / 11
z = 3
Then the percentage will be
P(32 < x < 98) = P(-3 < z < 3) × 100
P(32 < x < 98) = 0.9973 × 100
P(32 < x < 98) = 99.73%
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50PTS!
Describe the vertical asymptotes and holes for the graph of y = x-5/x^2 -1
What's the unit rate for 1 1/4 gallons per 44 1/2 miles
Answer:
5/178 gal/mi
35.6 mi/gal . . . . . take your pick
Step-by-step explanation:
As you have written the question, it is
(1.25 gal)/(44.5 mi) = (5/178) gal/mi ≈ 0.0280899 gal/mi
___
Usually, mileage is expressed in miles per gallon in the US. The unit rate in those units is ...
178/5 mi/gal = 35.6 mi/gal
_____
Comment on mileage unit rates
A "unit rate" is any rate that has 1 unit in the denominator. That is, the rate 5 gal/(178 mi) is not a unit rate, but (5/178) gal/mi is a units rate. They both use the same fraction, but the latter has 1 unit in the denominator and the fraction in the numerator: (5/178 gal)/mi.
Outside the US, mileage (energy use for transportation) is often expressed in terms of (amount of fuel)/(given distance). For example, the above mileage might be expressed as 1.745 gal/(100 km), or 6.607 L/(100 km). The "unit" in this scenario is 100 km.
In the US, the typical mileage specification is (distance)/(gallons). So, your question in terms of gallons per mile could mean that is the unit rate you're looking for (.028 gal/mi). Or it could mean we need to convert it to the typical US mileage specification. We cannot tell.
Harvey has a fair eight-sided die that has a different number from 1 to 8 on each side. If he rolls the die twice, what is the probability that the second number rolled is greater than or equal to the first number? Express answer as a common fraction.
The probability that the second number rolled is greater than or equal to the first number when rolling a fair eight-sided die twice is 1/16.
Explanation:To find the probability that the second number rolled is greater than or equal to the first number when rolling a fair eight-sided die twice, we need to determine the favorable outcomes and the total number of possible outcomes.
There are 8 possible outcomes for the first roll and 8 possible outcomes for the second roll. However, since the die is fair and has different numbers on each side, the second roll can only be greater than or equal to the first roll for 4 of the outcomes.
Therefore, the probability is 4 favorable outcomes out of 64 total outcomes, which simplifies to a probability of B
The measure of the angle is fourteen times greater than its supplement
jonathan goes to th store and purchases 3 pencils for 0 .28 each, and x number of erasers for 0.38each write an expression that shows how much jonathan spent
Keywords
linear equation, variables
Step 1
Define the variables
Let
x-----> number of erasers
y-----> total cost
we know that
[tex]y=3(0.28)+(0.38)x[/tex]
[tex]y=0.84+(0.38)x[/tex] ------> this is the linear equation that represent the situation
therefore
the answer is
[tex]y=0.84+(0.38)x[/tex]
Use inductive reasoning to describe the pattern. Then find the next two numbers in the pattern. –5, –10, –20, –40, . . .
Answer:
Next two number would be –5, –10, –20,–40, –80, –160.
Step-by-step explanation:
Given : –5, –10, –20, –40, . . .
To find : Use inductive reasoning to describe the pattern. Then find the next two numbers in the pattern.
Solution : We have given that
–5, –10, –20, –40, . . .
We can see from given pattern
-5 * 2 = - 10.
- 10 * 2 = - 20 .
-20 * 2 = - 40
So, each number is multiplied by 2 to get next number.
-40 * 2 = - 80 .
- 80 * 2 = - 160 .
Therefore, Next two number would be –5, –10, –20,–40, –80, –160.
Christian has $6 in his wallet and wants to spend it on apples. how many apples can Christian buy
Which of the following groups have terms that can be used interchangeably?
a. critical value, probability, proportion
b. percentage, probability, proportion
c. critical value, percentage, proportion
d. critical value, percentage, probability
Final answer:
The correct answer is option b. percentage, probability, and proportion, because these terms relate to ratios or fractions of a whole and can often be used interchangeably in various statistical contexts. So the correct option is b.
Explanation:
The question is asking which of the following groups contain terms that can be used interchangeably. The correct answer is b. percentage, probability, proportion. These terms can often be used interchangeably because a percentage is a way of expressing a proportion as a number out of 100, and probability is the measure of the likelihood that an event will occur, often expressed as a decimal or a proportion. None of the other options provided (a, c, and d) contain directly interchangeable terms.
Steps:
Understand that the terms percentage, probability, and proportion all relate to ratios or fractions of a whole.Recognize that critical value is a concept used in hypothesis testing and does not equate to any of the other terms mentioned.Choose the answer that includes terms that can be used in similar contexts to express a part of a whole or likelihood.The amount $0.3994 rounded to the nearest cent
Jodi poured herself a cold soda that had an initial temperature 36 degrees F and immediately went outside to sunbathe where the temperature was a steady 99 degree F. After 5minutes the temperature of the soda was 46 degree F .Jodi had to run back into the house to answer the phone . What is the expected temperature of the soda after an additional 13 minutes ?
The expected temperature of the soda after an additional 13 minutes is estimated to be 72°F. This estimation is based on the assumption of a linear temperature increase, calculated from the temperature change observed during the first 5 minutes outside.
Explanation:The student's question involves the expected temperature of soda after a certain time outside in a hotter environment. Since this scenario does not involve a phase change like melting ice, but rather heating up from the surrounding air, we can infer that Newton's Law of Cooling may be applicable. The Law states that the rate of heat transfer between an object and its surroundings is proportional to the difference in temperature between them. However, without a specific rate of heat transfer given, we cannot apply a formula directly. Therefore, we might assume an approximate linear relationship based on the information provided.
Here's a possible approach:
Initial temperature of soda: 36°FTemperature of soda after 5 minutes: 46°FIncrease over 5 minutes: 46°F - 36°F = 10°FAverage rate of temperature increase: 10°F / 5 minutes = 2°F per minuteExpected additional increase after 13 minutes: 13 minutes * 2°F per minute = 26°FStarting temperature for this period: 46°FExpected temperature after an additional 13 minutes: 46°F + 26°F = 72°FThis logic assumes a simple linear rate, which might not be precisely accurate but should provide an estimated answer.
Determine if the statement is true or false, and justify your answer. the product of the eigenvalues (counting multiplicities) of a is equal to the constant term of the characteristic polynomial of
a.
Jonny is jogging along a track. He has already jogged 1 2/3 miles. He plans to jog a total of 3 1/4 miles. How many miles does he have left to jog?
A carpenter has 166 doorknobs in his workshop. Of those doorknobs, 98 are round and the rest are square. If he wants to place 7 square doorknobs in each bin, about how many bins would he need?
Answer:
about 10 bins
Step-by-step explanation:
First, we need to find out how many doorknobs are square:
166 - 98 = 68
Then, we need to divide the number of square doorknobs, 68, by the number of square doorknobs in each bin, 7: 68 ÷ 7
68 is closer to 70. So,
68 ÷ 7 is about 70 ÷ 7.
So, 68 ÷ 7 is about 10.
identify the decimals labeled with the letters A,B and C on the scale below
The solution is :
A represents the decimal 3.23
B represents the decimal 3.34
C represents the decimal 3.17
What is decimal?A decimal is a number that consists of a whole and a fractional part. Decimal numbers lie between integers and represent numerical value for quantities that are whole plus some part of a whole.
here, we have,
Calculating the decimal values:
We can see that there are 10 divisions between 3.2 and 3.3.
The difference between the two points for 10 divisions is 3.3 -3.2 = 0.1 unit.
Therefore, one division will be equal to 0.1/10 = 0.01 unit
So, point A is 3 divisions after 3.2, thus
A = 3.2 + 0.01×3
A = 3.23
Similarly,
B = 3.3 + 0.01×4
B = 3.34
And,
C = 3.2 - 0.01×3
C = 3.17
Hence, The solution is :
A represents the decimal 3.23
B represents the decimal 3.34
C represents the decimal 3.17
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You have 24 homework problems for math class. You finish 1/2 of them during some extra time in class. If you complete 4 more problems while waiting for the bus, what fraction of the 24 problems will remain?
Answer:
[tex]\frac{8}{24} =\frac{1}{3}[/tex]
Step-by-step explanation:
In order to solve this, you just have to add up the fractions and calculate how much is that:
[tex]\frac{24}{24}- (24(\frac{1}{2} )+\frac{4}{24} )\\[/tex]
Now you just have to add up and then withdraw from the total:
[tex]\frac{24}{24}- (24(\frac{1}{2} )+\frac{4}{24} )\\\frac{24}{24}- \frac{12+4}{24} \\\frac{24}{24}- \frac{16}{24} =\frac{8}{24}[/tex]
SO now we know that he has 8/24 problems to do, if we reduce that we have that he still has to do 1/3 of the problems.
In a fraternity with 34 members , 18 take mathematics, 5 take both mathematics and physics and 8 take neither mathematics nor physics. How many take physics hit not mathematics?
If the square of a positive integer is added to 2 times the integer, the result is 195 . Find the integer
The positive integer for which its square added to two times the integer equals 195 is 13. This is found by solving the quadratic equation x² + 2x - 195 = 0, which factors to (x + 15)(x - 13) = 0.
To find the positive integer where the square of the integer added to two times the integer equals 195, we need to represent this algebraically. Let's denote the integer as x. The equation based on the given condition is:
x² + 2x = 195
To solve for x, we rearrange the equation into a standard quadratic form:
x² + 2x - 195 = 0
We can solve this quadratic equation by factoring, completing the square, or using the quadratic formula. The factoring method seems suitable here, as we can look for two numbers that multiply to -195 and add to 2. In this case, the integers are 13 and -15.
So our factored equation is:
(x + 15)(x - 13) = 0,
giving us the solutions x = -15 and x = 13. Since we are looking for a positive integer, the answer is x = 13.
A rectangular room is 4 meters longer than it is wide, and its perimeter is 28 meters. Find the dimension of the room.
Answer: The width of the room = 5 meters
The length of the room = 9 meters
Step-by-step explanation:
Let the w denotes the width of the room , then length of the room will be :-
[tex]\text{length}=4+w[/tex]
The formula of perimeter of rectangle :-
[tex]\text{Perimeter}=2(l+w)\\\\\Rightarrow\ 28=2(4+w+w)\\\\\Rightarrow\ 28=2(4+2w)\\\\\Rightarrow\ 28 =8+4w\\\\\Rightarrow\ 4w=20\\\\\Rightarrow\ w=5[/tex]
Hence, The width of the room = 5 meters
The length of the room = 5+4 = 9 meters
The width of the room is 5 meters, and the length is 9 meters.
Explanation:To find the dimensions of the rectangular room, let's assign variables. Let x be the width of the room. Since the length is 4 meters longer than the width, we can represent the length as x + 4.
Given that the perimeter is 28 meters, we can write an equation: 2(x + 4) + 2x = 28.
Simplifying the equation, we get 4x + 8 = 28. Subtracting 8 from both sides gives 4x = 20. Dividing both sides by 4, we find x = 5. The width of the room is 5 meters, and the length is 5 + 4 = 9 meters.
Two cars leave towns 300 kilometers apart at the same time and travel toward each other. One car's rate is 16 kilometers per hour more than the other's. If they meet in 2 hours, what is the rate of the faster car?
To find the rate of the faster car, set the speed of the slower car as 'x' km/h and the speed of the faster car as 'x + 16' km/h. Since they meet in 2 hours, and the total distance is 300 km, the equation is 2x + 2(x + 16) = 300. The faster car's speed is found to be 83 km/h.
Explanation:The question involves solving for the rate of the faster car when two cars travel towards each other from a distance of 300 kilometers apart and meet after 2 hours. We'll designate the speed of the slower car as 'x' km/h, which implies the speed of the faster car is 'x + 16' km/h. Since they meet in 2 hours, the total distance covered by both cars together is 300 kilometers.
Using the formula for distance (distance = rate × time), we can set up an equation:
2x + 2(x + 16) = 300
Simplifying this equation:
2x + 2x + 32 = 300
4x = 268
x = 67
The speed of the slower car is 67 km/h, and therefore, the rate of the faster car must be 67 + 16, which is 83 km/h.
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write the slope- intercept form of the equation of the line parallel to - x+5y=25, passing through the point (-5,-5). simplify
To find the equation of a line parallel to -x+5y=25 and passing through (-5, -5), we determine that the slope of the given line is 1/5. Using the point-slope form with the given point and the slope, we derive the slope-intercept form of the equation as y = 1/5x - 4.
To write the slope-intercept form of the equation of the line parallel to -x+5y=25 and passing through the point (-5, -5), we first need to find the slope of the given line. To do this, we rearrange the equation into slope-intercept form (y = mx + b), where m represents the slope and b represents the y-intercept.
Starting with the given equation:
-x + 5y = 25
Add x to both sides to isolate the y-terms:
5y = x + 25
Now divide everything by 5 to solve for y:
y = (1/5)x + 5
From this, we can see that the slope (m) of the line is 1/5. Since parallel lines have the same slope, the slope of our new line will also be 1/5.
Now we will use the point-slope form of the equation to find the line that passes through (-5, -5) with a slope of 1/5. The point-slope form is y - y₁ = m(x - x₁), where (x₁, y₁) is a point on the line.
Substituting the given point and the slope into the point-slope form, we get:
y - (-5) = 1/5(x - (-5))
Simplify the equation:
y + 5 = 1/5(x + 5)
Now distribute the slope:
y + 5 = 1/5x + 1
Finally, subtract 5 from both sides to find the y-intercept (b):
y = 1/5x - 4
This is the slope-intercept form of the equation of our line: y = 1/5x - 4.
a recipe for 1 batch of cookies uses 3/4 cup of sugar. How many cups of sugar are used 1 1/2 batches of these cookies?
The ratio will remain constant. Then the number of cups of sugar used in 1 and 1/2 batches of these cookies will be 1.125.
What are ratio and proportion?A ratio is an ordered set of integers a and b expressed as a/b, with b never equaling 0. A percentage is a mathematical expression in which two things are equal.
A recipe for 1 batch of cookies uses 3/4 cup of sugar.
Then the number of cups of sugar used in 1 and 1/2 batches of these cookies will be
We know that the ratio will remain constant. Then we have
1 and 1/2 can be written as 3/2.
Let x be the number of cups of sugar.
Then the ratio will be
[tex]\rm \dfrac{x}{3/2} = \dfrac{3/4}{1}\\\\x = \dfrac{3 \times 3}{2 \times 4}[/tex]
Then we have
x = 9/8
x = 1.125 cups of sugar
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a guy walks into a store and steals $100 from register, comes back and buys $70 worth of merchandise, pys for it with same $100 and gets $30 cash back. how much did store lose?
write a 5 digit number that when rounded to the nearest thousand and hundred will have a result that is the same explain
$185 with a 6% percent markup
the pressure of a gas p(v) varies inversely with the volume of the gas v. The pressure of a gas measure 15 kg/cm2 when its volume 300 cm3
p(v)=20v
p(v)=20/v
p(v)=4500v
p(v)=4500/v
Answer:
p(v)= 4500/v
Step-by-step explanation:
took it
a stadium holds 50000 people. the stadium is dived into 250 different seating section. how many seats are in each section?
Carrie pays a monthly fee of $8 to stream movies online. She also pays a fee every time she rents a movie. Last month Carrie rented 6 movies, and her total bill for the month was $32.
the difference of 9 and the quotient of a number x and 4 is 65
Penny percent. Suppose you flip a coin 100 times, with 53 tosses landing heads up. What percentage of the tosses would be heads? What percentage would be tails?
how do you sketch sin, cos and tan waves?
To sketch sin, cos, and tan waves, determine the amplitude and period, plot points on a graph, and connect them smoothly.
Explanation:For a sine wave, start by determining the amplitude (A), which represents the maximum height of the wave. Then calculate the period (T) using 2π divided by the coefficient of x. Use these values to plot points on a graph and connect them smoothly to create a wave.For a cosine wave, follow the same steps as for a sine wave, but start with a different phase shift (p) value in the wave function.To sketch a tangent wave, start by finding the period using π divided by the coefficient of x. Plot points on a graph using tangent values at regular intervals and connect them.