Question

Mrs. Hall records the heights of 50 students in a spreadsheet. The mean height is 68 inches. After looking at the data again, she realized that two of the 50 observations were outliers that must have been typos, 82 and 86 inches. She deleted these two observations. What is the new mean, rounded to the nearest hundredth?

Answer 1

67.3 repeating. You multiply 68 times 50, subtract 82 and 86, them divide by 48. If that doesn't work, try dividing by 50. That should work. 

Answer 2

68 × 50 = 3400 (combined height of the class)
3400-(82+86)=3232 (combined height without outliers)
3232÷48=$67\frac{1}{3}inches$