The average age of 15 students in a primary school is 12 years the average age of 16 students is 15 years and that of 18 student is 14 years. find the average age of all the student ?
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{(X/15=12)+(X/16=15)+(X/18=14)} / (15+16+18)
= (180+240+252) / (15+16+18)
= 672/49
=13.71
= (180+240+252) / (15+16+18)
= 672/49
=13.71
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