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The arithmetic mean of 30 values is 69. New mean, if each of the 30 values is increased by 5 is 74? But can you give me explanation?
Most Upvoted Answer
The arithmetic mean of 30 values is 69. New mean, if each of the 30 va...
A+b+../30=69
a+b+..=69*30...(i)
now each no is increased by 5
i.e.. a+5 + b+5+...=(a+b+...)+5*30
hence new mean
(a+b+..)+5*30/30(applying (i)
i.e69*30+5*30/30=(69+5)*30/30=69+5=74
Community Answer
The arithmetic mean of 30 values is 69. New mean, if each of the 30 va...
Let n1, n2 ,n3 up to n30 be the terms
given
(n1+n2+ n3+up to n30)/30=69
hence n1+n2+n3 upto n30=2070
now,if 5 is added to each term then
[(n1+5)+(n2+5)+(n3+5)+up to (n30+5)]/30
=[(n1+n2+n3+ up to n30)+30×5]/30
=(2070+150)/30
=74
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The arithmetic mean of 30 values is 69. New mean, if each of the 30 values is increased by 5 is 74? But can you give me explanation?
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