The list shows the heights of 6 students in inches: 63, 70, 68, 73, 58, 67. What is the mean absolute deviation for these numbers?
A- 24
B- 66.5
C- 4
D- 67.5

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.