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March 30, 2017

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In a set of 400 values, the mean is 121 and the standard deviation is 14. Estimate how many values fall in between each interval?
a) 107 - 135
b)93 - 149
c) 79 - 163

  • math - ,

    107 = µ-1σ
    135 = µ+1σ
    So, what % is within 1σ of µ? Your Z table says 68.27% of 400 or 273

    Treat the other numbers similarly

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