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8 October, 02:52

Spencer was 40 inches tall as a 4-year old which placed him in the top 10% of all children of similar age. the mean height for such children is 38 inches. based on this information, what is the standard deviation?

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  1. 8 October, 03:45
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    The 90th percentile is 1.2816 standard deviations from the mean. That tells you the standard deviation is ...

    ... (40 in - 38 in) / (1.2816) ≈ 1.56 in

    The standard deviation for height for 4-year olds seems to be 1.56 inches.
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