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Re: Exam grades among the students in Ms. Harshman’s class are n [#permalink]
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deekochhar wrote:
Lets treat 50 percentile as 50% (number of )students scored 77 which means that the average mean or median is 77.

Now As normal distribution is mentioned if we go 3 S.D up on right side we get 80 and if we go 3 S.D. down which is left we get 74. So the number of students are going to be same.
As Each Standard Deviation will have X number of students and 3 S.d which up or down will be 3X hence same number of students.

Answer is C


I think you misunderstood. SD is not given. 3 more and below the mean is the raw number below or above the mean (it includes both the SD times the number of times)
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Re: Exam grades among the students in Ms. Harshmans class are n [#permalink]
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Re: Exam grades among the students in Ms. Harshmans class are n [#permalink]
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