English, 25.07.2020 18:01 kingjonesjr
A nationwide survey of 100 boys and 50 girls in the first grade found that the daily average number of boys who are absent from school is 15, with a standard deviation of 7. For girls, the average number of absentees is 10, with a standard deviation of 6. The standard deviation of the difference is .
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A nationwide survey of 100 boys and 50 girls in the first grade found that the daily average number...
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