North Around, Inc. stock is expected to return 22 percent in a boom, 13 percent in a

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Question:

North Around, Inc. stock is expected to return 22 percent in a boom, 13 percent 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 sock?