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Q.
If the arithmetic mean of seventy-five numbers is calculated, it is 35. if each number is increased by 5, then mean of new numbers is :
A.
30
B.
40
C.
50
D.
60
View Answer
Correct choice: B
Explanation:
Let the numbers are x,x2,.......x75 By Hypothesis ,x1+x2+....x75/75=35 ......(i) Mean of new numbers = (x1+5)+(x2+5)+.......(x75+5)/75 x1+x2+......x75+5*75/75 x1+x2+......x75/75+375/75=35+5=40 By (i)
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