A random sample of 49 statistics examinations was taken. The average score, in the sample, was 84 with a variance of 12.25. The 95% confidence interval for the average examination score of the population of the examinations is   . 83.45 to 84.55.     80.07 to 87.93.     82.99 to 85.01.     80.5 to 87.5.

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