You’ve observed the following returns on crash-n-burn computer’s stock over the past five years: 14 percent, –9 percent, 16 percent, 21 percent, and 3 percent. for this stock, calculate the:
a. arithmetic average return (as a percentage, to 2 decimal places)
b. historical variance (to 5 decimal places)
c. standard deviation. (as a percentage, to 2 decimal places)

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.