Mathematics, 29.11.2021 21:40 rose200215

Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar. 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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