Shipment Times. A survey of 36 selected recording companies showed these numbers of days that it took to receive a shipment from the day it was ordered. Days Frequency 1-3 6 4-6 8 7-9 10 10-12 7 13-15 O 16-18 Find each of these: a. Variance b. Standard Deviation c. Quartile d. PercentileANSWER THE FOLLOWING. Note: = sign is congruent in meaning. 1. 2*50 = (mod 7'} * 2.43'1D=1 mud 11 *