Question

the mean of 21 observations is 40 if each observation greater than the median are increased 21 then mean of observation will become?

Answer 1

# Answer- 50.

# Given-

total observations = 21

mean = 40.

# Solution-

Now sum of all observations will be 21×40=840.

Median will occur at (21+1)/2 =11th number.

So there will be 10 observations after the median.

Each of these observations are increased by 21.

Total increase will be 21×10=210.

New grand total=840+210=1050.

New mean = 1050/21 = 50.

The new mean is 50.

Answer 2

Answer:

50

Step-by-step explanation:

Find the sum of the 21 observations:

mean = 40

Sum = 40 x 21 = 840

Find the median term:

Median term = (21 + 1)/2 = 11th term

Find the number of terms after the median term:

Number of terms = 21 - 11 = 10

Sum of the increased:

1 term = 21

10 terms = 21 x 10 = 210

Sum of the 21 observations after the increased:

Sum = 840 + 210 = 1050

Find the mean of the 21 observations:

Mean = 1050 ÷ 21 = 50

Answer: The new mean is 50