- #1
KatieLynn
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Homework Statement
If there are 4 children in a family, find the probability of getting exactly 3 girls. Find the mean, variance, and standard deviation. Use two different methods(binomial distribution method and general probability distribution method).
Homework Equations
Binomial distribution equations:
Mean=np
variance=npq
standard deviation= sq. root of variance
The Attempt at a Solution
mean= (4)(.75)=3
variance=(4)(.75)(.25)=.75
s.d.= .866
is that right?