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Variance and Standard Deviation

If the standa...

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If the standard deviation of sample sizes 50 and 100 are 8 and 7 . The standard deviation of combined size sample is

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Q. The means of two samples of sizes 50 and 100 respectively are 54.1 and 50.3 and the standard deviations are 8 and 7. Find the mean and the standard deviation of the sample of size 150 obtained by combining the two samples.

Q. The Standard Deviation of a sample of size 10 is 11. If the value of each sampled item is reduced by 2, the new Standard deviation will be

Q. A sample of 35 values has mean 80 and Standard Deviation 4 . A second sample of 65 values from same population has mean 70 and standard deviation 3. Find the mean and standard deviation of combined sample of 100 values.

Q. The means of two samples of size

40

50

were found to be

54

63

respectively. Their standard deviations were

6

9

respectively. The variance of the combined sample of size

90

Q. The means of two samples of size

40

50

were found to be

54

63

respectively. Their standard deviations were

6

9

respectively. The variance of the combined sample of size

90

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