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標題:
Statisitics
發問:
The mean height of 54 boys and 36 girls is 162cm. If the mean height of the girls is 153cm, then what is the mean height of the boys?
最佳解答:
Total height of the 90 people is 162 x 90 = 14580 cm Total height of girls = 36 x 153 = 5508 cm So total height of boys = 14580 - 5508 = 9072 cm with mean = 9072/54 = 168 cm
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