The service time distribution describes the probability p that the service time of the customer will be no more than t hours. if m is the mean number of customers serviced in an hour, then p=1-e^mt

option d.

Step-by-step explanation:

You have the following formul given in the problem:

You know that:

The number of  customers serviced in an hour by the technical support representative is 6 costumbers, therefore:

As the problem asked for the probability that  a costumber will be on hold less than 30 minutes, we know that:

Substitute the values above into the formula.

Then, you obtain:

or 95%

step-by-step explanation:

a and d

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of