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30 students were randomly selected from a large group of students taking a certain calculus test....

30 students were randomly selected from a large group of students taking a certain calculus test. The mean score for the students in the sample was 87. Assume that σ=7.4. Construct a 99% confidence interval for the mean score, μ, of all students taking the test.
A) 84.7-89.3
B) 83.52-90.48
C) 83.53-90.47
D) 83.67-90.33
Math   Statistics-And-Probability   
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