1.There is a bag with 62 balls. 31 are blue and 31 are red. In 20 pulls from the bag, 20 balls are red. What is the probability with replacement that the 21^st pull will be red?

a).5000

b).2500

c).000000477

d).03125

e) none of the above

2.The lengths of time bank customers must wait for a teller are normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute.

A. What proportion of bank customers waits between 3 and 4 minutes

B.  What percentage wait more than 4 minutes?

C. What proportion waits between 1 and 3 minutes?

D. What percentage wait less than 1 minute?