Hakim, Nadia, Ravi and Aisha compared their Mathematics test scores. The average score of all four friends was 78. Hakim scored 82, Nadia scored 71 and Ravi scored 90. What was Aisha's score?
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Worked Solution
Step 1: Use the relationship Total = Average x Number of data.
Total of all 4 scores = 78 x 4 = 312
Step 2: Find the sum of the three known scores.
82 + 71 + 90 = 153 + 90 = 243
Step 3: Subtract to find Aisha's score.
Aisha's score = 312 - 243 = 69
Step 4: Verify.
82 + 71 + 90 + 69 = 312, and 312 / 4 = 78
Answer: Aisha's score was 69.
Correct answer: 69
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