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Question 1: _(20 points) (A) The number of mobile phones sold daily at XYZ electronics has the following probability distribution 38 44 X: # of

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Question 1: _(20 points) (A) The number of mobile phones sold daily at XYZ electronics has the following probability distribution 38 44 X: # of mobiles sold P(X x) 36 0.4 48 0.1 0.2 0.3 a) What is the mean (Expected value) of the number of mobiles sold on a given day? b) What is the variance of the number of mobiles sold on a given day

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