Scores on the verbal ability portion of the Graduate Record Examination (GRE) follow a normal distribution with mean 500 and standard deviation 115 .
a. Between what two values do the middle $95 \%$ of scores fall?
b. If your score is 650 , then you did better than what percentage of exam takers?
c. Suppose you study a random sample of 100 GRE verbal exams. Determine the probability that the average (mean) score in this sample will be between 485 and 515.

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The Answer of Scores on the verbal ability portion of the Graduate Record Examination (GRE) follow a normal distribution with mean 500 and standard deviation 115 .
a. Between what two values do the middle $95 \%$ of scores fall?
b. If your score is 650 , then you did better than what percentage of exam takers?
c. Suppose you study a random sample of 100 GRE verbal exams. Determine the probability that the average (mean) score in this sample will be between 485 and 515.

Scores on the Verbal Ability Portion of the Graduate Record 95%95 \%95%

Scores on the Verbal Ability Portion of the Graduate Record $95 \%$