American University of Armenia Algebra Standard Deviation Worksheet

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Mathematics

American University of Armenia

Description

For boys, the average number of absences in the first grade is 15 with a standard deviation of 7; for girls, the average number of absences is 10 with a standard deviation of 6.

In a nationwide survey, suppose 100 boys and 50 girls are sampled. What is the probability that the male sample will have at most three more days of absences than the female sample?

(A) 0.025
(B) 0.035
(C) 0.045

(D) 0.055

Explanation & Answer:
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Explanation & Answer

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Solution
The correct answer is C. For this analysis, let P1 = the proportion of Republican
voters in the first state, P2 = the proportion of Republican voters in the second
state, p1 = the proportion of Republican voters in the sample from the first state,
and p2 = the proportion of Republican voters in the sample from the second state...


Anonymous
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