Multiple choice

DIRECTION for the question: Solve thefollowing question and mark the best possibleoption.The average of 10 numbers is 40.2. Later it isfound that two numbers have been wronglycopied. The first is 18 greater than the actualnumber and the second number added is 13instead of 31. Find the correct average.

  1. 40.2

  2. 40.6

  3. 40.4

  4. 40.8

  5. 40.5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Initial sum = 10 * 40.2 = 402. Error 1: 18 added instead of subtracted (or vice versa). The problem says 18 greater than actual, so subtract 18. Error 2: 13 added instead of 31, so add (31-13) = 18. Net change = -18 + 18 = 0. Correct sum = 402. Average = 40.2.

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