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The confidence interval of the mean mark of a sample of 144 students in a test is (60.90 , 63.10). What is the accuracy of

The confidence interval of the mean mark of a sample of 144 students in a test is (60.90 , 63.10). What is the accuracy of the interval if the mean mark is 62 with a standard deviation of 5.1? Select one: O a. 75% O b. 99% O c. 95% O d. 90%

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