Mean of a set of numbers is the quotient when their sum is divided by the number of items in the set. For the given above, their sum (S) is,
S = 5.2 + 8.3 + 8.5 + 7.7 + 7.8 + y = 37.5 + y
The mean (m) is calculated through the formula,
m = S / n
where n is the number of items. In this given there are 6 items including y.
7.1 = (37.5 + y) / 6 ; y = 5.1
Therefore, y is equal to 5.1.
5X + 17 = 42
-17 -17
5X = 42
—— ——
5 5
X = 5
B.
5 squared + 12 squared = x squared
5 squared = 25
12 squared = 144
144+25 = 169
Square root of 169 = 13
Hope this helps you!! ❤️❤️
