Question

The mean of 24 numbers is 35. If 3 is added to each number, what will
be the new mean?
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Answer 1

Answer:

x1+x2+x3+..….....+x24/24=35

x1+x2+x3+..….....+x24=840

if 3 is added to 24 observations then

(x1+3)+(x2+3)+(x3+3)+…......+(x24+3)

=(x1+x2+x3+...........+x24)+3×24

=840+72

=912

the new mean is= 912/24=38