The time, T, between emissions radioactive emissions has an eponential distribution with a mean of 4 seconds between emissions.
a) What is the parameter lambda of the exponetial distribution?
b) What is the probability that T is less than 4 sec?
c) What is the probability that T is greater than 4 sec?
d) What is the expected value of T?
e) What is the variance of T?
g) What is the variance of 3T?
h) What is the expected value of 3t +7?