Average of 20 results is 35. Later, it was found one score 45 was misread as 25. What is the correct average?
Show answer & explanation
Correct answer: A
Explanation
Given:
Number of results = 20
Incorrect average = 35
Incorrectly read score = 25
Correct score = 45
Formula:
Total = Average × Number
Incorrect total = 35 × 20 = 700
Correct total = 700 − 25 + 45 = 720
Correct average = 720 / 20 = 36