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Math Help and check

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The weights of ripe watermelons grown at Mr. Smith's farm are normally distributed with a standard deviation of 2 lb. Find the mean weight of Mr. Smith's ripe watermelons if only 5% weigh less than 18 lb. (Give your answer correct to one decimal place.)
Incorrect: Your answer is incorrect. . 8.8 lb
I have tried this one several times and can not get it right, please help!!!!!

  • Math Help and check - ,

    .05 is P(Z<-1.645)
    That is, 18 is 1.645 std below the mean.
    So, the mean is 18+2*1.645 = 21.29

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