he 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 the results shown in the table below. Complete​ (a) through​ (c) to the right. Arrivals frequency 21 0 1 44 2 41 3 36 4 23 5 17 6 10 7 5 8 3 find the standard divison