Question

the mean of 40 observations is 28 . it was found later than an observation 52 was wrongly taken as 22 . the correct new men is​

Answer 1

Answer:

28.75

Step-by-step explanation:

Sum with incorrect data is it

$= 40 \times 28 = 1120$

We can correct the sum by taking 22 out of the sum and adding 52 to it.

Hence, actual Sum is

$= 1120 - 22 + 52 = 1150$

And mean is

$\frac{1150}{40} = 28.75$

Answer 2

Answer:28.75

Step-by-step explanation:

Mean of 40 observations=28

Sum of 40. Observations=28×40=1120

given that 52 is taken as 22

Actual sum of 40 observations=1120-22+52

=1098+52

=1150

Actual mean of 40 observations=1150/40

=28.75