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The mean height of 25 boys in a class is 150 cm , and the mean height of 35 girls in the same class is 145 cm . The combined mean height of 60 students in the class is `"_______"` (approximately).A. 143 cmB. 146 cmC. 147 cmD. 145 cm |
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Answer» Correct Answer - c Given `n_(1) = 25 , n_(2) = 35` `barx_(1) = 150` and `barx_(2) = 145` Combined mean , `barx = (n_(1) barx_(1) + n_(2)barx_(2))/(n_(1) + n_(2))` `barx = (25 xx 150 + 35 xx 145)/(25 + 35) = (3750 + 5075)/(60)` `= (8825)/(60) = 147` (approximately ) . |
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