Q. The heights (in cm) of 40 boys were measured and recorded as under:
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| Height (in cm) | 165 | 170 | 175 | 180 |
| Number of boys | 9 | 8 | 11 | 12 |
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Find the mean height.
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mean = sum of all observations ÷ number of all observations = 1485+1360+1925+2160÷40 =173.25
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