Question

Miss Claire recorded the scores her students obtained in a math quiz as follows:
$65,62,67,71,71,72,95$
What is the mean score excluding the outlier?

• A. $60$
• B. $62.61$
• C. $68$
• D. $73.15$

Answer 1

The correct option is C $68$

An outlier is a value in a data set that is either too small or too large compared to other values of the same data set.

Since most data points in the given data set lie between $65$ and $73,$ the outlier is $95.$

We need to calculate the mean excluding the outlier.

Mean $=\frac{\text{sum of all data points}}{\text{number of data points}}$


Thus, mean without the outlier $=\frac{65+62+67+71+71+72}{6}=68$