QuestionJuly 17, 2025

(05.04 MC) The data to represent average test scores for a class of 16 students includes an outlier value of 72. If the outlier is included, then the mean is 86. Which statement is always true about the new data when the outlier is removed? The mean would increase. The mean would decrease. The median would increase. The median would decrease.

(05.04 MC) The data to represent average test scores for a class of 16 students includes an outlier value of 72. If the outlier is included, then the mean is 86. Which statement is always true about the new data when the outlier is removed? The mean would increase. The mean would decrease. The median would increase. The median would decrease.
(05.04 MC)
The data to represent average test scores for a class of 16 students includes an outlier value of
72. If the outlier is included, then the mean is 86. Which statement is always true about the new
data when the outlier is removed?
The mean would increase.
The mean would decrease.
The median would increase.
The median would decrease.

Solution
4.6(203 votes)

Answer

The mean would increase. Explanation 1. Calculate the total sum with outlier Total sum = Mean \times Number of students = 86 \times 16 = 1376 2. Calculate the sum without outlier Sum without outlier = Total sum - Outlier = 1376 - 72 = 1304 3. Calculate new mean without outlier New mean = Sum without outlier / (Number of students - 1) = 1304 / 15 = 86.9333 4. Compare means The new mean is greater than the original mean.

Explanation

1. Calculate the total sum with outlier<br /> Total sum = Mean $\times$ Number of students = $86 \times 16 = 1376$<br />2. Calculate the sum without outlier<br /> Sum without outlier = Total sum - Outlier = $1376 - 72 = 1304$<br />3. Calculate new mean without outlier<br /> New mean = Sum without outlier / (Number of students - 1) = $1304 / 15 = 86.9333$<br />4. Compare means<br /> The new mean is greater than the original mean.
Click to rate: