Home
Class 12
MATHS
Mean and standard deviation of 20 observ...

Mean and standard deviation of 20 observations are 10 and 2.5. It is observed that one entery was taken as 25 instead of 35 , then correct mean and variance is ?

A

10.5 , 26

B

10.5 , 25

C

11 , 26

D

11 , 25

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Similar Questions

Explore conceptually related problems

The mean of 10 observations is 10.3 by an error an observation is registered as 32 instead of 23. The correct mean is

Mean and variance of 20 observation are 10 and 4. It was found, that in place of 11, 9 was taken by mistake find correct variance.

The mean of 10 observation is 16.3. By an error one observation id is registered as 32 instead of 23. Then the correct mean is

The mean and standard deviation of 6 observations are 8 and 4 respectively . If each observation is multiplied by 2, find the new mean and new standard deviation of the resulting observation.

Mean of 20 observations is 15.5. Later on it was found that the observation 24 was taken as 42. The correct mean is-

The mean and standard deviation of six observations are 8 and 4, respectively.If each observation is multiplied by 3, find the new mean and new standard deviation of the resulting observations.

The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53 The correct mean is

The geometric mean of 6 observation was calculated as 13. It was later observed that one of the observation was recorded as 28 instead of 36. The correct geometric mean is

The mean of 10 observations is 15.5 . By an error , one observation is registered as 13 instead of 34. Find the actual mean .