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If the arithmetic mean of 7,9,1,13,x,21 ...

If the arithmetic mean of 7,9,1,13,x,21 is 13, find the value of x.

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MODERN PUBLICATION-STATISTICS-EXERCISE
  1. The number of children in 10 families of a locality are: 2,4,3,4,2,0,3...

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  2. The following are the number of books issued in a school library durin...

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  3. If the arithmetic mean of 7,9,1,13,x,21 is 13, find the value of x.

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  4. The mean of 20 numbers is 43, if 6 is subtracted from each of the numb...

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  5. The mean of 12 numbers is 40. if each numbers if divided by 8, what wi...

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  6. The mean of 20 numbers is 18, if 3 is added to each of the first ten n...

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  7. The mean of 100 items was found to be 64. later on, it was discovered ...

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  8. The mean of 200 items was 50. later on, it was discovered that the two...

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  9. The mean of six numbers is 23. if one of the number is excluded, the m...

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  10. The mean of 5 numbers is 18, if one number is excluded, their mean is ...

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  11. The mean of marks scored by 100 students was found to be 40, later on,...

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  12. Obtain the sum of the deviations of the observations 3,4,6,8,14 from t...

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  13. If barx is the mean of ten natural numbers x1,x2,xy………..x10 show that:...

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  14. Durations of sunshine in Delhi for first 10 days of Auguse, 2016 as re...

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  15. Durations of sunshine in Delhi for first 10 days of Auguse, 2016 as re...

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  16. A cricketar has a mean score of 58 runs in nine innings. Find out how ...

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  17. The average monthly salary of 20 workers in an office is Rs 7650. If t...

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  18. The mean of 31 results is 60. if the mean of first 16 results is 58 an...

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  19. There are 50 students in a class, of which 40 are boys. The average we...

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  20. Find the mean of the following data

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