The distribution of the number of transactions per day at a certain automated teller machine (ATM) is

approximately normal with a mean of 80 transactions and a standard deviation of 10 transactions. Which of

the following represents the parameters of the distribution?

A. x = 80, s = 10

B. x = 80, s^2 = 10

C. x = 80, = 10

D. = 80, = 10

E. = 80, s= 10

Scientists estimate that the distribution of the life span of the Galpagos Islands giant tortoise is

approximately normal with mean 100 years and standard deviation 15 years. Based on the estimate, which of

the following is closest to the age of a Galpagos Islands giant tortoise at the 90th percentile of the

distribution?

A. 80

B. 115

C. 120

D. 125

E. 130

small coffee shop, the distribution of the number of seconds it takes for a cashier to process an order is

approximately normal with mean 276 seconds and standard deviation 38 seconds. Which of the following is

closest to the proportion of orders that are processed in 240 to 300 seconds?

A. 0.17

B.0.26

0.44

D. 0.56

E. 0.83

Gina's doctor told her that the standardized score (z-score) for her systolic blood pressure, as compared to the

blood pressure of other women her age, is 1.50. Which of the following is the best interpretation of this

standardized score?

A. Gina's systolic blood pressure is 150

B. Gina's systolic blood pressure is 1.50 standard deviations above the average systolic blood pressure for

women her age.

C. Gina's systolic blood pressure is 1.50 above the average systolic blood pressure of women her age.

D. Gina's systolic blood pressure is 1.50 times the average systolic blood pressure for women her age.

E. Only 1.5% of women Gina's age have a higher systolic blood pressure than she does.