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SAT® Math

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A Stratified Sample

SATMAT-S2LC1G

In a stratified sample, the goal is to make the sample look like the larger population with respect to some characteristic. For example, if a researcher wants to conduct a survey in school that is $60\%$ boys and $40\%$ girls, she should make sure that $60\%$ of the people she surveys are boys.

Suppose a researcher wants to conduct a statistical study in a school with $714$ boys and $992$ girls.

If she plans to survey $250$ people, how many boys should she survey?

A

$150$

B

$105$

C

$180$

D

$145$