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Please I want the final answer quickly The following is the probability distribution for calls arrived at a switchboard of one of the leading companies

Please I want the final answer quickly

The following is the probability distribution for calls arrived at a switchboard of one of the leading companies No. Calls (X) PIX) 0.15 10.33 13 0.3 117 ? What is the Calls Variance ? Write your answer to the nearest 2 decimals)

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