b Compute the probability of receiving exactly 10 calls in 20 minutes Now we are to find the probability of receiving 10 calls in a 20 minute interval It is given that on average 36 calls are received per hour so this must be converted to a 20 minute inter We previously found that on average there are 0 6 calls per minute To find the mean number of calls in a 20 minute interval multiply the mean number of calls per minute by 20 20 minutes mean number of calls per minute 20 Thus on the same 20 minute time interval we have Submit Skip you cannot come back Need Help Read It Submit Answer calls per 20 minutes and x