q14 Suppose X is time to take a portion of the SAT test and f(x) = x/8 from 0 to 4 hours. Find the mean of X.

3 hours

1 hour

8/3 hours

2 hours

None of the other choices is correct

q17 X is the amount of money withdrawn from an ATM machine at a bank.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. Ninety percent of the withdrawals are more than what amount? (Allow coins to be withdrawn as well as dollar bills.)

None of the other choices is correct

$23.20

$105.40

$176.80