Question

The average of four three-digit numbers was calculated to be 335. However, it was realized that the digit '8' was misread as '3' in the second position of one number and in the third (last) position of another number. What would be the average of these four numbers after correcting this mistake?

• A. 340.55
• B. 348.75
• C. 350.5
• D. 358.75

Answer 1

Answer:

B. 348.75

if x3y was taken instead x8y Difference between 2 numbers = x8y - x3y = 50 if ab3 was taken instead of ab8 difference between two numbers = ab8 - ab3 = 5 total difference=50 + 5 = 55 average= 55 ÷ 4 = 13.75 if the mistake is solved = 335 + 13.75 = 348.75