A person sells new cars for a company. They usually sells the largest number of cars on Saturday. He established the following prob

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A person sells new cars for a company. They usually sells the largest number of cars on Saturday. He established the following probability distribution for the number of cars he expects to sell on a particular Saturday.

Number of cars sold (X) ----- 1 2 3 4

Probability: P(X) ----- 0.3   0.4 0.1 0.2

 

What is the standard deviation?

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