Average age of a group of 50 students is 60 yr. The average age becomes 62 yr. if 5 other students are also joined the group. The average age of new students is?
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Step-by-step explanation:
case -1:
N=50
A=60
A=S/N
S=AN
S=60(50)
S=3000
CASE-2:
N=55
A=62
S=55(62)
S=3410
sum of ages of 5 other students is 3410-3000
= 410
now s= 410
n=5
average age of 5 students= 410/5=82
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