Suppose that the times between arrivals of hits at a particular website can be described by and exponential distribution X with parameter Q

If Y is the random variable given by the sample mean on n inter-arrival times, write down an expression for an unbiased estimator T of Q

A random sample of 16 inter-arrival times gives a mean of 1.4 minutes. From this sample, find an estimate t of parameter Q

I got 0.71 for the 2nd part of the question....