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Problem 5.21
The increase or decrease in the price of a stock between the beginning and the end of a trading
day is assumed to be an equally likely random event. What is the probability that a stock will
show an increase in its closing price on five consecutive days? Show work.
Solution
P(increase) = P(decrease) = 0.5
P(increase for 5 times) = 0.5*0.5*0.5*0.5*0.5 = 0.5^5 = 0.03125

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