average hight of 12 students in a class is 132 cm and average higher of the remaining 24 student in that class is 138 cm what is average hight of a student in that class
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the average height of 12 students is 132 cm
the total height of 12 students is 132.12 cm
the average height of 24 students is 138 cm
total height of 24 students is 138.24 cm
total height of (12+24) students is (132.12+138.24)cm=12(132+138.2)cm
=12(132+276)cm=12.408cm=4896cm
total height of 36 students is 4896 cm
average height of 36 students is 4896/36 cm
=136 cm
so the average height of a student in that class is 136 cm
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