(Answered) Could you help me to solve the following stats problemthe

Engineering

Could you help me to solve the following stats problem?

The number of patients waiting for flu vaccine at A hospital has the following probability distributions.

x 1 2 3 4

p(x) 0.2 0.3 0.4 0.1

What is the variance of number of patients? What is the standard deviation of number of patients?

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