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The mean of 20 observations is 30. If th...

The mean of 20 observations is 30. If the mean of first 15 observations is 32, find the mean of last 5 observations.

A

22

B

24

C

26

D

30

Text Solution

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The correct Answer is:
B
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NAGEEN PRAKASHAN-STATISTICS-Exercise 14c
  1. Find the mean of the following data. (i) 3, 5, 3, 4, 2, 0, 7 and 10 ...

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  2. Find the arithmetic mean of first 6 natural numbers.

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  3. Find the mean of all factors of 10.

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  4. Find the mean of integers from -4 to 5

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  5. The mean of 3, a+2, 8, 12, 2a-1 and 6 is 7, find the value of a.

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  6. The mean of 16, 19, P, 21, 25, 28 is 22, find the value of P.

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  7. The mean of 20 observations is 30. If the mean of first 15 observation...

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  8. The mean of 25 observations is 72. It was detected that one observatio...

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  9. The mean monthly salary of 8 teachers is ₹ 32,000. When the salary of ...

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  10. Find the mean of the frequency distribution: (ii) The weight of ...

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  11. Find the median of (i) 7, 11, 25, 45, 23, 12, 11, 9, 10 (ii) 15,...

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  12. Find the median of first 7 prime numbers.

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  13. Find the median of first 10 even natural numbers.

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  14. The following data has been arranged in ascending order. If their medi...

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  15. Find the mode of (i) 7, 7, 8, 10, 10, 11, 10, 13, 14 (ii) 4, 5, 6...

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  16. Find the mode of following data:

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  17. Find the mode of following data:

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  18. Find the mean, median and mode of the following data: (i) 7, 19, 19...

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  19. Find the sum of deviations of the following data measured from their a...

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  20. The weights of 9 boxes in kgms are as follows: 27.5, 31.2, 28.0, 32...

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