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- 2013-8-23
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Variance =( .6^2 * 5^2 )+ (.4^2 * 4^2) + 2(.6)(.4)(5)(4)(.75) = (9) + (2.56) + (7.2) = 18.76
Standard Deviation = Sqrt(18.76) = 4.33
For questions 1 for Standard Dev do u take 5 or .05 4 or 0.04 and raise it to 2??.
.6^2*5^2 = 9 ????
I am CONFUSED NOW !! |
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发表于 2013-4-17 18:05
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