Question

mean of 20 observation is 75 if each observation is divided by 3,find the new mean

Answer 1

Mean = Sum of all observations /  Total No.of observations
75 = Sum / 20
Sum = 75 × 20
Sum = 1500

According to question,
All observations had been divided by 3

So, Sum of all Observations / 3
          = 1500 / 3
          = 500

New Mean = 500 / 20
                  = 25

Mean = 25
Hope it helps thumbzz up please

Answer 2

73/3 which gives 25... there for new mean is 25.