The number of telephone calls that arrive at a phoneexchange is often modeled as a Poisson random variable. Assumethat on the average there are 10 calls per hour. Determine the followingprobabilities:a. exactly 5 calls in one hourb. 3 or fewer calls in one hourc. exactly 15 calls in two hoursd. exactly 5 calls in 30 minutes

Sam makes his sales calls according to a pattern. he travels either north or south depending on the calendar. some of his past trips were as follows: on february 17, april 24, june 10, september 19, and november 3 he drove north. on february 28, may 25, august 22, november 20, and december 18, he drove south. describe sams' pattern. in which direction will sam drive on oct4 and oct 24?

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?

When a rectangle is dilated, how do the perimeter and area of the rectangle change?