Could someone help me ?

Based on what i know about mean, this doesn't add up.

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?