The number of arrivals per minute at a bank located in the central business district of a large city was recorded over a period of 200 minutes with...

a. Compute the mean number of arrivals per minute

b. Compute the standard deviation for the number of arrivals per minute.

X F F.X α σ2 0 22 0 -2.495 6.225 1 43 43 -1.495 2.235 2 46 92 0.495 0.245 3 38 114 0.505 0.255 4 24 96 1.505 2.265 5 14 70 2.505 6.275 6 8 48 3.505 12.285 7 4 28 4.505 20.295 8 1 8 5.05 30.305...