Question

What is the difference between the average of books sold by stores A and E together and average of books sold by stores C and D together?

• A. 33
• B. 11
• C. 22
• D. 44

Hint:

To compare averages from pie charts, always calculate the individual values first using the total and then compute the mean. Don’t forget to subtract carefully!

Answer 1

The Correct Option is D

From the pie chart:
Total number of books = 1100
Store A = 18% of 1100 = 198
Store E = 22% of 1100 = 242
Average of A and E = \dfrac{198 + 242}{2} = \dfrac{440}{2} = 220
Store C = 16% of 1100 = 176
Store D = 32% of 1100 = 352
Average of C and D = \dfrac{176 + 352}{2} = \dfrac{528}{2} = 264
Now, the difference = 264 - 220 = \boxed{44}