I think this question has to do with the lower bound of the confidence interval since the mean of the sample is above 100. What is the formula you've...
We don't know the standard deviation of the population, but we do know that SD of the sample. See this page. It looks like this isn't the way you are...
You may need to add an empty pair of braces before the superscript, like this: {}^{A}B. Otherwise, the superscript will attach itself to the previous...