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Thread: Normal Distribution

  1. #1
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    Smile Normal Distribution




    Assuming that the number of marks scored by a candidate is normally distributed, find the mean and the standard deviation, if the number of first class students(60% or more marks) is 25, the number of failed students(less than 30%marks) is 90 and the total number of candidates appearing for the examination is 450.
    Help me solve . Thanks

  2. #2
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    Re: Normal Distribution


    You have two unknowns (mean and stddev) and two equations. Just have to transform the numbers to proportions, thats where you need the total number of participants.

    good luck!

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    wajeeha yasin (12-31-2016)

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