I. A sales manager receives 6 calls on average between 9:30 a.m. and 10:30 a.m. on a weekday.

Find the probability that:

a) he will receive 2 or more calls between 9:30 a.m. and 10:30 a.m. on a certain weekday.

b) he wiI1 receive exactly 2 calls between 9:30 a.m. and 9:40 a.m. on a certain weekday.

c) during a 5 day working week, there will be exactly 3 days on which he will receive no

calls between 9:30 a.m. and 9:40 a.m.

II. Suppose an ordinary six-sided die is rolled r