Question

3. The mean of 15 observations is 7.6. If 2 is added to
first 7 observations each and 1 is subtracted from the
remaining 8 observations each, find the new value of mean​

Answer 1

Answer:

Mean of 15 observations = 20

Sum of 15 observations = 20×15 = 300

If 8 is added to all the observations,

Sum of 15 observations = 300+15×8 = 420

New mean =

15

420

= 28

Answer 2

Answer:

Step-by-step explanation:

The observations are: 6,8,9,15,x,x+2,21,22,25,29

The number of observations are 10. Since, the observations are even, the median will be the mean of

2

n

and

2

n

+1 observations

median = mean of

2

10

and

2

10+2

observations

median = mean of 5

th

and 6

th

observations

median =

2

x+x+2