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15 January, 03:40

If your school have 255 students, about how many would you expect to have an iq less than 70?

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  1. 15 January, 06:17
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    6

    Step-by-step explanation:

    Assuming a mean of 100 and standard deviation of 15, 70 is 2 standard deviations below the mean.

    According to the empirical rule, 95% of the population is within ±2 standard deviations. Which means half of that, or 47.5%, is between 0 and - 2 standard deviations. Since 50% of the population is below 0, then 2.5% is below - 2 standard deviations.

    2.5% of 255 is approximately 6.
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