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22 August, 04:26

A set of data has a normal distribution with a mean of 5.1 and a standard deviation of 0.9. Find the percent of data greater than 6.9.

about 16 %

about 34%

about 13.5%

about 2.5%

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  1. 22 August, 04:36
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    P (x > 6.9) = 1 - P (x < 6.9) = 1 - P[z < (6.9 - 5.1) / 0.9] = 1 - P (z < 2) = 1 - 0.97725 = 0.02275.

    Therefore P (x > 6) is about 2.5%
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