He spends a lot of time for peacekeeping.

My mother was surprised when she saw my report card.

They (referring to women or girls) are my best friends.

He had a hard time accepting his bad grade.

He always maintains good grades.

He has a very passive personality.

By looking at the moving average of stock prices, you can grasp the trend of the market.

Please calculate the arithmetic mean of this dataset.

The geometric mean is one way to represent the median of a set of numbers.

I learned how to calculate the harmonic mean in math class.