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statistics and probability questions, solve clearly, show steps and in 30 minutes for thumbs up vote...

statistics and probability questions, solve clearly, show steps and in 30 minutes for thumbs up vote

Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children. Find the probability of
a. Exactly 4 girls in 10 births.
b. At least 4 girls in 10 births.
c. Exactly 8 girls in 20 births.

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