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29 May, 12:07

Use the normal distribution of fish lengths for which the mean is 1111 inches and the standard deviation is 44 inches. assume the variable x is normally distributed. left parenthesis a right parenthesis (a) what percent of the fish are longer than 1212 inches? left parenthesis b right parenthesis (b) if 300300 fish are randomly selected, about how many would you expect to be shorter than 77 inches?

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  1. 29 May, 12:33
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    (a) P (x > 12) ≈ 0.4013

    About 40% of the fish are longer than 12 inches.

    (b) 300*P (x < 7) ≈ 48

    about 48 of 300 fish could be expected to be shorter than 7 inches.
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