Four friends measured their heights at the Tampines Recreation Centre. The average height of the four friends is 144 cm. Three of them are 140 cm, 148 cm and 152 cm tall. What is the height of the fourth friend?
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Worked Solution
Step 1: Use the relationship Total = Average × Number of data values.
Total height of 4 friends = 144 × 4
= 576 cm
Step 2: Find the sum of the three known heights.
140 + 148 + 152
= 288 + 152
= 440 cm
Step 3: Subtract to find the fourth friend's height.
Fourth friend's height = 576 − 440
= 136 cm
Answer: 136 cm
Correct answer: 136 cm
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