Please answer letter d.
The time between calls to a plumbing supply business is exponentially distributed
with a mean time between calls of 15 minutes.
a) What is the probability that there are no calls within a 30-minute interval?
b) What is the probability that at least one call arrives within a 10-minute
c) What is the probability that the first call arrives within 5 and 10 minutes after
d) Determine the length of an interval of time such that the probability of at least
one call in the interval is 0.90.
Step 1ler T denote the time untill the first call.Given, the random variable T is exponentially distributed with lambda=(1)/(15) calls/minute.f(t)=(1)/(15)e^(-t//15),quad t > 0distribut ... See the full answer