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26 October, 00:53

Dave surveyed 80 7th-graders and 90 8th-graders. He found that about 75% of the 7th-grader like pop music, while 80% of the 8th-graders like pop music. Do more 7th-graders or more 8th-graders like pop music? Explain.

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  1. 26 October, 01:15
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    Step-by-step explanation:

    There are 80 7th-graders and about 75% of them like pop music

    This means that roughly 75% of the 80 7th-graders like pop music

    so, 75 / 100 X 80 like pop music

    therefore, roughly 60 7th-graders like pop music

    80 - 60 = 20

    That means roughly 20 7th-graders don't like pop music

    Also, there are 90 8th-graders and 80% of them like pop music

    which means, 80 / 100 X 90 like pop music

    therefore, 72 8th-graders like pop music

    90 - 72 = 18

    This means 18 8th-graders don't like pop music

    since 72 > 60

    and 18 < 20

    It is obvious that more 8th-graders like pop music
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