A toll-free phone number is available from 9 A.M to 9 P.M. to your customers wanting to register a complaint with a product purchased from your company.

Question

Past history indicates that an average 0.4 calls are received per hour.

Assuming that this situation matches the properties you discussed in (a), what then is the probability that during a 1-hour period:

a) One phone call will be received?

b) Two phone calls will be received?

Answer 1

With a history of .4 calls per hour the probability of getting one call in an hour is 4/10 or 2/5

The probability of getting two calls would be the probability of one times the probability of the other.

in this case 2/5 times 2/5 or 4/25