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The following table shows the I.Q. of 48...

The following table shows the I.Q. of 480 schoolchildren. Find
(i) the mean.
(ii) the standard deviation using the step deviation method. Use Charlier's check to verify the computation of the standard deviation.

Text Solution

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The correct Answer is:
`bar(X)=95.97, sigma=10.47`
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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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