the average height of 40 students is 172cm. 30 students whose average height is 172.5cm left the class and 40 students whose average height is 170.5cm joined the class. find the average height of the present class.
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I don't know but I am sorry I tried it later
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Answer:
sum of 40 students ; 172 * 40 ; 6880
and of 30 students who left class; 172.5 * 30; 5175
now left with 10 students in class and weight of class; 6880-5175; 1705
the weight of 40 new students; 40 * 170.5 ; 6820
so new total of 50 students; 6820 + 1705 ; 8525
avg ; 8525/50 ; 170.5
Step-by-step explanation:
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