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1 March, 16:23

For a distribution with a mean of 80 and standard deviation of 10, at least what percentage of values will fall between 60 and 100?

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  1. 1 March, 18:09
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    Find the Z score of both:

    Z = (X-μ) / σ

    Z₁ = (60-80) / 10 = = > - 2

    & Z₂ = (100-80) / 10==>+2

    & you will find on the Z score tables that the probability to be between

    60 & 100 is 0.95 or 95%
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