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the lenght of a species of fish is normally distributed with a mean of 24.3 inches and a standard deviation of 1.8 inches. What is the lenght that is exceeded by 30%of these fish

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    http://davidmlane.com/hyperstat/z_table.html

  • statistics -

    You will have to determine z-score (use a z-table with the information you are given), then use the z-score formula to find x (the length).

    Z-score formula is this:

    z = (x - mean)/sd
    mean = 24.3
    sd = 1.8

    Once you find the z-score in the table, substitute the z-score and the data above into the formula and solve for x.

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