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Math Help - normal distribution

  1. #1
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    normal distribution

    can anyone help with this problem please:

    the problem involves oranges n the masses in grams
    the mass X grams of a particular variety of orange is normally distributed with mean 205g and standard deviation 25g

    if the smallest 30% of oranges are graded 'small', how do you determine the maximum weight of an orange graded 'small'?


    thanks, n apologies as that is all the information i have. i mainly looking for help how to determine it rather than the answer please.
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  2. #2
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    Quote Originally Posted by smiler View Post
    can anyone help with this problem please:

    the problem involves oranges n the masses in grams
    the mass X grams of a particular variety of orange is normally distributed with mean 205g and standard deviation 25g

    if the smallest 30% of oranges are graded 'small', how do you determine the maximum weight of an orange graded 'small'?


    thanks, n apologies as that is all the information i have. i mainly looking for help how to determine it rather than the answer please.
    Solve for a: \Pr(X \leq a) = 0.3.
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