Inverse Normal

At Chili's, the average wait time to receive your meal is 22 minutes with a standard deviation of 9 minutes. What is the wait time for the top 12% ? Round to the nearest minute.

• 39 minutes

• 37 minutes

• 33 minutes

• 31 minutes

Suppose the amount of soda in a can is normally distributed; the mean is 16 oz and standard deviation is 0.4 oz. How much soda is in the heaviest 3% of cans?

Suppose the amount of soda in a can is normally distributed; the mean is 16 oz and standard deviation is 0.4 oz. How much soda is in the lightest 22% of cans?

An ​ (a)   takes a previously found result ( a y value) and returns it to its original value (x value). This means you are ​ (b)   a function

• function

• inverse

• 2 or more

• undoing

Are these the graphs of two inverse functions?

• Yes

• No

• No way to tell

The weights of paper discarded each week by households are normally distributed with a mean of 9.43 pounds and a standard deviation of 4.17 pounds. The top 10% of households discard at least ______ pounds of paper.

X ~ N (14, 49)

Find x if P(X < x) = 0.8

• 19.9

• 8.1

• 5.0

• 23.0

X ~ N (14, 49)

Find x if P(X < x) = 0.46

• 9.7

• 13.3

• 14.7

• 18.3

Find x if P(|X|< x) = 0.5

• 2.34

• 3.99

• 0

• 2.47

A batch of thermometers have readings that are normally distributed with a mean of 0 degrees Celsius, and a standard deviation of 1 degree Celsius. Find the temperature that separates the bottom 30% from the top 70%.

• -0.52

• 0.52

• 1.52

• -1.52