Calculus and Above

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number of incorrect answers is...

The scores of 225 tests are randomly selected, and the number of incorrect answers is noted for each of the tests in the sample. The sample mean is 14.5 incorrect answers and the sample standard deviation is s = 8.2 incorrect answers.a) Provide an 80% confidence interval for the mean number of incorrect answers per test during the past year.My solutions guide says the answer is [14.04 , 14.96], while I keep getting [13.80, 15.20] using the formula 1.282*8.2/sqrt(225). Any direction on where I am going wrong would be great. Thank you!

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