I can't see pictures, but I will try to help.
To find mean, you add all of the numbers together, then divide the new number by how many there are.
To find median, you order the numbers from least to greatest, then find the one in the middle. If there are two middle numbers, like 76 and 80, the median would be the middle of those numbers, or 78.
To find mode, you, again, order the numbers from least to greatest, then find the most of the same number(like 4,4,5,5,5...5 is the mode).
To find range, you find the biggest and smallest numbers and subtract the two numbers. The difference(answer to subtraction problem) is the range(80-76=4).
Example problem: 1,2,3,4,5,6,7,8,9
1+2= 3+3+4= 11+5= 17+6= 23+7= 30+8= 38+9= 47
47/9=5.2
Mean: 5.2
Median: 5
Mode: none
9-1=8
Range: 8
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hope it helps
