the mean of 5 observation is 12 if each observation is added by 5 then find new mean
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mean of 5 nos = 12
total = 12 x 5 = 60
now 5 is added to each number
new total = 60 + 5 x 5 = 60+25=85
new mean = 85/5 = 17
total = 12 x 5 = 60
now 5 is added to each number
new total = 60 + 5 x 5 = 60+25=85
new mean = 85/5 = 17
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