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Calculate the variance and standard devi...

Calculate the variance and standard deviation of the observations : 11, 12, 13, . . . .. 20.

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The correct Answer is:
`sigma=2.87`, variance = `sigma^(2)=8.27`
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ICSE-MEASURES OF DISPERSION-EXERCISE 21 (b)
  1. Five students secured marks as, 8, 10, 15, 30, 22. Find the standard d...

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  2. For a set of ungrouped values the following sums are found: " ...

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  3. The standard deviation of the numbers 2, 3, 11, 2x is 3""1/2. Calculat...

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  4. Calculate the variance and standard deviation of the observations : 11...

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  5. Find the standard deviation of the following set of numbers: 25, 50,...

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  6. Calculate the possible values of x, if the standard deviation of the n...

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  7. Calculate the standard deviation for the following distribution:

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  8. Calculate the standard deviation of the following data:

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  9. Calculate the standard deviation of the following data:

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  10. Calculate the standard deviation for the following data giving the age...

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  11. The heights, to the nearest cm, of 30 men are given below: {:(159, 1...

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  12. Find the mean and the standard deviation from the following:

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  13. The following table shows the I.Q. of 480 schoolchildren. Find (i) t...

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  14. In a certain test, the 30 scores were grouped as follows: Calcula...

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  15. The number of faults on the surface of each of 1000 tiles were distrib...

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  16. The mean and the standard deviation of 25 observations are 60 and 3. L...

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  17. The scores of two golfers for 10 rounds each are: Which may be re...

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  18. Goals scored by two teams A and B in a football season were as follows...

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  19. The mean of the numbers a, b, 8, 5, 10 is 6 and the variance is 6.80. ...

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