Homework Answers
E(X) = 0(0.15) + 1(0.20) + 2(0.30) + 3(0.10) + 4(0.20) + 5(0.05) = 2.15
E(X2) = 02(0.15) + 12(0.20) + 22(0.30) + 32(0.10) + 42(0.20) + 52(0.05) = 6.75
Hence,
Standard deviation = 
= 1.46
Option D is correct.
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