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The following is the probability distribution for calls arrived at a switchboard of one of the leading companies: No. Calls (X) P(X) 10.1 0.36 12

The following is the probability distribution for calls arrived at a switchboard of one of the leading companies: No. Calls (X) P(X) 10.1 0.36 12 0.25 19 ? What is the Calls Variance ? Write your answer to the nearest 2 decimals)

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