Question

Scores on the GRE​ (Graduate Record​ Examination) are normally distributed with a mean of 525 and a standard deviation of 98 . Use the 68 dash 95 dash 99.7 Rule to find the percentage of people taking the test who score above 623. The percentage of people taking the test who score above 623 is nothing %.

Answer 1

Hello SIr/ Mam

YOUR REQUIRED ANSWER IS 16%

Given that:

Mean = 525

S.D. = 98

68-95-99.7 rule says that:

• 68% of the observations lie within 1 S.D. of the mean.
• 95% of the observations lie within 2 S.D. of the mean.
• 99.7% of the observations lie within 3 S.D. of the mean.

Hence,

It is clearly visible that:

623 = 525 + 1*98

Hence, 623 is 1 S.D. away from mean.

Hence,

I hope this solves your doubt.

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