Answer:
3.1 * 10^10
Step-by-step explanation:
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
.
They won 20/30, so 100 / 30 = 3.3, then times by 20 = 66.66.
Hope this helps.
Step-by-step explanation:
3x + 3 = 27
3x = 24
Therefore x = 8.
Answer:
I think it's c
Step-by-step explanation: