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1). 5.1 feet2). 5.2 feet3). 6.2 feet4). 5.4 feet |
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Answer» Average height of 18 boys = 5 feet Total sum of heights of boys = average height × number of boys Total sum of heights of boys = 5 × 18 Total sum of heights of boys = 90 feet Also average height of remaining 12 students = 5.5 feet Total sum of heights of 12 boys = average height × number of boys Total sum of heights of 12 boys = 5.5 × 12 = 66 Total sum of heights of 30 boys = 90 + 66 = 156 ∴ Average height of 30 boys = 156/30 = 5.2 |
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