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A random sample of 25 statistics examinations was selected. The average score in the sample was 77 with a variance of 121. Assuming the scores

A random sample of 25 statistics examinations was selected. The average score in the sample was 77 with a variance of 121. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is _____.

a. 71.88 to 82.12

b. 71.33 to 82.67

c. 70.85 to 83.15

d. 71.52 to 82.48

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