Determine mean and standard deviation for numbers of girls

In a test of a gender-selection technique, 150 couples each have one baby, and the results consist of 100 girls and 50 boys.

a. Find the mean and standard deviation for the numbers of girls that would occur in groups of 150 births.

b. Is the result of 100 girls unusual? Why or why not?

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Determine mean and standard deviation for numbers of girls : in a test of a gender-selection technique 150 couples each have one baby and the results consist of 100 girls and 50

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