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Standard deviation of the estimated returns

Carson Inc.'s manager believes that economic conditions during the next year will be strong, normal, or weak, and she thinks that the firm's returns will have the probability distribution shown below. What's the standard deviation of the estimated returns?

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## Q : Determining the minimum horizontal force

A wooden block weighing 7 N is at rest on top of a wooden desk. The coefficient of static friction between the block and the desk is 0.41. Find the minimum horizontal force required to move the block if the following occurs.