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Find the mean and standard deviation using short-cut method

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Find the mean, variance and standard deviation using short cut method.

Find the variance and standard deviation of :

The mean and standard deviation of six observations are 8 and 4, respectively. If each observation is multiplied by 3, find the new mean and new standard deviation of the resulting observations.

(b)The mean and standard deviation of 6 observations are 8 and 4 respectively.If each observation is multiplied by 3,find the new mean and new standard deviation of the resulting observations.

A student obtained the mean and standard deviation of 100 observations as 40 and 5.1 respectively . It was later found that one observation was wrongly copied as 50, the correct figure being 40. Find the correct mean and S.D.

Find the variance and standard deviation for the following data 65,68,58,44,48,45, 60,62,60,50

Find the mean ,standard deviation and coefficient of variation for the following frequency distribution .

Find the standard deviation for the data :

In a binominal distribution mean is 6 and standard deviation is sqrt2 .What is the number of trials.

Find the standard deviation for the following data

V PUBLICATION-STATISTICS-QUESTION BANK
  1. Write the sum of first n natural numbers.

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  2. Find the mean and variance of the first 10 multiples of 3.

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  3. Find the mean and standard deviation using short-cut method

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  4. Find the mean and variance for the following frequency distribution.

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  5. Find the mean, variance and standard deviation using short cut method.

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  6. Two plants A and B of a factory show following results about the numbe...

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  7. Coefficient of variation of two distributions are 60 and 70 and their ...

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  8. The following values are calculated in respect of heights and weights ...

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  9. The following is the rècord of goals scored by team '(A)' in a footbal...

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  10. The sum and squares corresponding to length x(in cm) and y(in gm) of 5...

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  11. The variance of 20 observations is '5 .' If each observation is multip...

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  12. The mean of 5 observations is 4.4 and their variance is 8.24.If three ...

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  13. If each of the observation x1,x2,………..xn is increased by 'a',where a...

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  14. The mean and standard deviation of 100 observations were calculated as...

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  15. The mean and variance of 7 observations are 8 and 16 respectively. If ...

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  16. The mean and standard deviation of six observations are 8 and 4, respe...

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  17. The mean and standard deviation of marks obtained by. 50 students of a...

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  18. Calculate the mean deviation about median from the following data 340...

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  19. Find the mean deviation about the mean for the following data: 6,7,10,...

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  20. Find the variance and standard deviation for the following data 65,68...

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