North Around, Inc.stock is expected to return 22percent in a boom, 13percent in a normal economy, and -15 percent in a recession.The probabilities of a boom, normal economy, and a recession are 6 percent, 92 percent, and 2 percent, respectively.What is the standard deviation of the returns on this stock?
A)2.15 percent
B)4.6 percent
C)20.54 percent
D)18.79 percent
E)4.53 percent

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The Answer of North Around, Inc.stock is expected to return 22percent in a boom, 13percent in a normal economy, and -15 percent in a recession.The probabilities of a boom, normal economy, and a recession are 6 percent, 92 percent, and 2 percent, respectively.What is the standard deviation of the returns on this stock?
A)2.15 percent
B)4.6 percent
C)20.54 percent
D)18.79 percent
E)4.53 percent