A small lesson.
A clearer next step.

Mean and median describe the center of a set of numbers in different ways. One unusual value can change them differently.

Imagine five original daily reading times: ten, ten, fifteen, twenty, and seventy minutes. Put the values in order before finding the median.

The median is the middle value. There are five numbers, so the third number is the middle: fifteen minutes.

The mean is the total divided by how many values there are. The sum is one hundred twenty five. Divide by five to get twenty five minutes.

The seventy minute session pulls the mean upward. The median stays closer to the smaller reading times in this example.

With an even number of values, average the two middle values to find the median. Never just choose one of them.

Try it: two, four, six, eight. The mean is five. The median is also five, halfway between four and six. Include the units when the data has them.