Let's put them from least to greatest:
7, 12, 13, (40), 88, 95, 95
The median would be the number in the middle, therefore it's 40.
To get the mean, add them all together and you'll get 350. There are 7 numbers, do 350 divided by 7 and you'll get 50.
The mode mode would be 95. The mode is 95 because there's more than one of the same number.
Hope this helps!