During one month there were 7 days of precipitation . what if there had only been 3 days of precipitation that month? how would that change the measures of center?

The measures of center would most likely get smaller.

I assume that we are looking for the average rainfall during a month. If we had 7 days, there would be more rain meaning higher measures of center.

On the other hand, with only 3 days, they would most likely be lower. Unless, we had a lot of rain on those 3 days.