This is probably super simple to most of you on here, but I was chatted by a friend earlier with a question. It reads just like this:

```
A sample of n =7 scores has a mean of M =5. After one new score is added to the sample, 
the new mean is found to be M =6. What is the value of the new
score? (Hint: Compare the values for E X before and after the score was added.)

```

She said the E X looks like the greek symbols. Can someone please explain this problem to me and provide a solution or tell me how to solve it? I guess I don't understand the question or how to set up an equation to solve it. Thanks!