The bar graph shows the number of paintings sold by an art gallery in each month from January to June.
How many paintings does it need to sell in July for the 7 month average to be 90?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 100
Average = Sum of all paintings/Total months
Sum of paintings of 6 month i.e jan to june is
(95 + 78 + 97 + 110 + 60 + 90) = 530
We need average of 90 for first 7 month so sum must be
sum = 90 × 7 = 630
Paintings which were sold in july = 630 - 530 = 100.