What is 7/9÷1/3 I really want to know

Given this information, which expression must represent the value of b?

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.