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15. Statistics
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Q18 of 23 Page 15

Calculate the A.M. and S.D. for the following distribution:

Given, The data is given in table/

To Find: Find the standard deviation


The formula used: SD =


Explanation:



Now, N=79, ,


Mean






Variance = 305.20


Standard Deviation


SD = 17.47


Hence, The standard deviation is 17.47

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16

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 were recorded as 21, 21 and 18. Find the mean and standard deviation if the incorrect observations are omitted.

17

Following are the marks obtained, out of 100, by two students Ravi and Hashina in 10 tests:


Who is more intelligent and who is more consistent?

19

While calculating the mean and variance of 10 readings, a student wrongly used the reading of 52 for the correct reading 25. He obtained the mean and variance as 45 and 16 respectively. Find the correct mean and the variance.

20

The mean and variance of 7 observations are 8 and 16, respectively. If five of the observations are 2, 4, 10, 12, 14. Find the remaining two observations.

Questions · 23
15. Statistics
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