Answer
$(7.8841, 16.116)$
Work Step by Step
SRS: 400
x bar: 12
standard deviation: 42
After collecting those three numbers, you'll use your graphing calculator. The steps are as followed:
1.) STAT
2.) Move over to TESTS
3.) Choose number 7 (Z-Interval)
4.) Enter in the above numbers and then calculate.
(7.8841, 16.116)
