Assume that we want to construct a confidence interval. Do one of the following, as appropriate. (a) find the critical value to /2. (b) find the critical value Za/2, or (c) state that neither the normal distribution nor the t distribution applies, 40- The confidence level is 90%, a is not known, and the histogram of 55 player salaries (in 30- thousands of dollars) of football players on a team is as shown, Frequency 20- 10- 4000 8000 12000 16000 200 Salary (thousands of dollars) Select the correct choice below and, if necessary, fill in the answer box to complete your choice. OA. 1712= (Round to two decimal places as needed.) O B. 712= (Round to two decimal places as needed.) C. Neither the normal distribution nor the t distribution applies