The sum of 20 observations of the deviat...

The sum of 20 observations of the deviation from 30 is 20. Their mean is

A

30

B

30.1

C

29

D

31

Text Solution

Verified by Experts

The correct Answer is:

D

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Find the algebraic sum of the deviations of all the observations from their mean.

Two sets each of 20 observations , have the same standard deviation 5. The first set has a mean 17 and the second a mean 22. Determine the standard deviation of the set obtained by combining the given two sets.

Knowledge Check

The mean of 100 observations is 50 and their standard deviation is 5. The sum of all squares of all the observations is ………….

A

50000

B

250000

C

252500

D

255000

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The sum of squares of the deviation of the values of the variable is ……….when taken about arithmetic mean.

The mean of 20 observations is 45. If each observation is divided by 3, the new mean is 15

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The standard deviation is …….to the mean deviation taken from the arithmetic mean.

The variance of 20 observations is 5. If each observation is multiplied by 2, find the new variance of the resulting observations.

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Find the mean deviation about the mean for the data :

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