the neighborhood clinkos has a single copy machine. the copier has been observed on average 16 customers per hour during peak periods when it is never idle.; the servie time of this copier is exponentially distributed. customers arrive at the copir according to a poisson process with a mean of 12 customers per hour. what is the coefficient of variation of the customer interarrival time

The table below shows the approximate masses of a dust particle and a grain of pollen. dust particle 0.000000778 g grain of pollen 0.00000000155 g the mass of a dust particle can be estimated and written in the form a × 10^b, where a = 8 and b = the mass of a grain of pollen can be estimated and written in the form a × 10^b, where a = 2 and b = based on the estimates, the mass of a dust particle is approximately blank times larger than the mass of a grain of pollen.