Multiple choice Find the mean of the given data. 11, 13, 15, 9, 11, 21, 11 13 15 17 19 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Mean = sum of all values divided by count. Sum = 11+13+15+9+11+21+11 = 91. Count = 7. Mean = 91 ÷ 7 = 13. Option A is correct.