6.) Previous research says that 80% of pet owners take their pets with them on vacation. You randomly sample 100 pet owners. What's the chance that at most 75 of them take their pets with them on vacation?

a) .1056

b) None of the other choices is correct.

c) .3994

d) .8944

7.) X is the amount of money withdrawn from an ATM machine at a bank. X has a normal distribution with mean $100 and standard deviation $60. Ten percent of the withdrawals are less than what amount? (Allow coins to be withdrawn as well as dollar bills.)

a) $23.20

b). $154.00

c) None of the other choices is correct

d) $176.80

8.) The probability density function, or pdf, tells you how dense the probability is at each particular point x. It does not tell you the probability at that point x. Group of answer choices

a) True

b) False

9.) X has a uniform distribution from 5 to 10. What is f(x)?

a) 0

b) 1/5

c) Not enough information to tell.

d) 1/10

10.) The t-value in a confidence interval for mu when sigma is unknown is larger than the Z-value in a confidence interval for mu when sigma is known. Assume everything else is the same.

a) True

b) False

11.) Suppose someone reports that the average gas price in Ohio is $3.85 and you believe it's less than that. You sample 31 gas stations at random in Ohio and calculate the sample mean, $3.77, and sample standard deviation, $0.35. What is the test statistic?

a) 3.77

b) -1.27

c) Not enough information to tell.

d) 1.27

e) -.23