SOLUTION: The probability that a woman is widowed or divorced is 0.73. 16 women are interviewed at random. Let the random vairable X be defined as the number of women who are widowed or d

Question 916254: The probability that a woman is widowed or divorced is 0.73. 16 women are interviewed at random. Let the random vairable X be defined as the number of women who are widowed or divorced.
I found the expected value of this problem to be 11.68 however I do not quite understand how to get the standard deviation, can someone please help?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
Binomial Distibution
p = .73 , n = 16
mean = 11.68 0r 12 (reference is 'People')
sd = sqrt(npq) = sqrt(16*.73*.27) = 1.77.. 0r sd = 2
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