Question

The mean of 20 observations is 13 . If each observation is decreased by 5 . Find new mean

Answer 1

Answer:

8

Step-by-step explanation:

No. of observations = 20

Mean = 13

Sum of obs. / No. of obs. = 13

Sum of observations / 20 = 13

Sum of observations = 260

If each observation is decreased by 5 ,

Total decrease = 5 × 20 = 100

New sum = 260 - 100 = 160

New mean = 160/20 = 8

Answer 2

Answer

8

Step-by-step explanation:

No.of observation =20

Mean = 13

Sum of observations /No.of observations = 13

Sum of observations / 20=13

Sum of observations =260

if each observation is decreased by 5 ,

total decrease = 5×20=100

New sum = 260 -100 =160

New mean = 160/20 =8