The class marks of a distribution of the daily number of calls received by a small cab company are 22,27,32, 37, 42, 47 and 52. Find

(A) the class boundaries
(B) the class limits

The computer that controls a bank's automatic teller machine crashes a mean of 0.6 times per day. what is the probability that, in any seven-day week, the computer will crash less than 5 times? round your answer to four decimal places