Will mark brainliest
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?
a. the mean would increase.
b. the mean would decrease.
c. the median would increase.
d. the median would decrease

A.The mean would increase.

Step-by-step explanation:

Outliers are numerical values in a data set that are very different from the other values. These values are either too large or too small compared to the others.

Presence of outliers effect the measures of central tendency.

The measures of central tendency are mean, median and mode.

The mean of a data set is a a single numerical value that describes the data set. The median is a numerical values that is the mid-value of the data set. The mode of a data set is the value with the highest frequency.

Effect of outliers on mean, median and mode:

The mean of the test scores without the outlier is:

*Here n is the number of observations.

So, with the outlier the mean is 86 and without the outlier the mean is 86.9333.

The mean increased.

Since the median cannot be computed without the actual data, no conclusion can be drawn about the median.

Conclusion:

After removing the outlier value of 72 the mean of the test scores increased from 86 to 86.9333.

Thus, the the truer statement will be that when the outlier is removed the mean of the data set increases.

you probably already have the answer but anyways it's b. 15.0

step-by-step explanation: