Question: Probabilities, provided by the engaged couple, can help control the number of guests at their wedding. At the planning stage, decisions are necessarily based on

Probabilities, provided by the engaged couple, can help control the number of guests at their wedding. At the planning stage, decisions are necessarily based on the number of persons expected to respond yes to the RSVP. Concerning one group of four adults, the couple assigns probabilities to the number who will respond yes to the RSVP.

Number of yes Probability 0 .02 1 .06 2 .24 3 .40

Calculate the expected number to respond yes. Calculate the standard deviation.

Number of yes Probability 0 .02 1 .06 2 .24 3 .40 4 .28

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