Greatest Common Factors are the greatest numbers that go into a given group of numbers. The GCF of 54 and 84 is 6.
7 7 / 1 7 x 3 21
--- = ---------- = ------------- = --------- = 21 miles per gallon
1/3 1 / 3 1 x 1 1
Given:
The frequency distribution table.
To find:
The mean average score on a test.
Solution:
The frequency distribution table is

x a xa
y b yb
z c zc
Sum a+b+c xa+yb+zc
Now, the mean average score on the test is


Therefore, the mean average score on the test is
.
Yes you just have to cross multiply