Question

A department store manager has monitored the number of complaints received per week about poor service. The probabilities for numbers of complaints in a week, established by this review, are shown in the table. Number of complaints 0 1 2 3 4 5 Probability 0.19 0.21 0.41 0.05 0.08 0.06 What is the standard deviation of complaints received per week?

Answer 1

Pa No youra 2020/7/30 21:30 Answer A de pantment store manager has monitored the no. of complaints received per week about poor service. The probabilities for number of complaints in a week No. of complaints oil probability (Pi) 019 0.21 041 3 0.05 4 0:08 - wow find the standard deviation Standard deviation = E(x²) CE(x)? E(X) = Exipi' = 0.21 +0.92+0:15+0.32+0-3 EX) = 1.80 EcX?) = Ex Pi = 0.2173.28+1.35+5:12+7,50 E(X²) = 17.46 standard deviation = 2 (17-46) - (1.80) Jandard devianon = 3.77094 REDMI NOTE 6 PRO MI DUAL CAMERA