Home
Class 11
MATHS
The mean and standard deviation of 20 ob...

The mean and standard deviation of 20 observations are found to be 10 and 2, respectively. One rechecking, it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation in each of the following cases. (i) If

Promotional Banner

Topper's Solved these Questions

  • PRACTICE PAPER III

    CBSE COMPLEMENTARY MATERIAL|Exercise (Section-C)Long Answer Type-I|6 Videos

  • PRACTICE PAPER DESIGN - I

    CBSE COMPLEMENTARY MATERIAL|Exercise SECTION -D|6 Videos

  • PRACTICE PAPER-II

    CBSE COMPLEMENTARY MATERIAL|Exercise Section-D (Long Answer Type-I)|7 Videos

Similar Questions

Explore conceptually related problems

The mean and standard deviation of 18 observations are found to be 7 and 4 respectively. On rechecking it was found that an observation 12 was misread as 21. Calculate the correct mean and standard deviation.

The mean and standard deviation of 20 observations are found to be 10 and 2 respectively. On rechecking, it was found that an observation 8 was incorrect. Find the new standard deviation if wrong item is omitted.

The mean and variance of 10 observation are found to be 10 and 4 respectively. On rechecking it was found that an observation 8 was incorrect. If it is replaced by 18, then the correct variance is

The mean and variance of 20 observations are found to be 10 and 4. respectively. On rechecking, it was found that an observation 9 was incorrect and the correct observation was 11. Then the correct variance is

The mean and variance of 20 observations are found to be 10 and 4 respectively. On rechecking, it was found that an observation 8 is incorrect. If the wrong observation is omitted, then the correct variance is

The mean and variance of 10 observations are found to be 10 and 5 respectively. On rechecking it is found that an observation 5 is incorrect. If the incorrect observation is replaced by 15, then the correct variance is

Calculate mean and standard deviation from the following data:

The mean and standard deviation of a group of 100 observations were found to be 20 and 3, respectively.Later on it was found that three observations were incorrect,which are recorded as 21,21 and 18. Find the mean and standard deviation if the incorrect observations are omitted.