So you need to add up all the points he scored.
The mean is the average. Divide the total by the number of games he played.
Here, hopefully this picture cane help
Answer:
x = 11.18
Step-by-step explanation:
According to the Pythagorean Theorem; (Leg1)² + (leg2)² = (Hypotenuse)²
10² + x² = 15²
100 + x² = 225
x² = 125
x = 
x = 11.18
Hope this helps!
Are you trying to solve the function operation? If so, your solution is 4 I believe. I don't really have a lot of info on this, but I hope this helps. If not, feel free to comment below and I'll see what I can do to help you further on this. Thanks and good luck!