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प्रश्न
The algebraic sum of the deviations of a set of n values from their mean is
विकल्प
0
n – 1
n
n + 1
उत्तर
The algebraic sum of the deviations of a set of n values from their mean is 0
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संबंधित प्रश्न
The mean of 5 observations is 50. One of the observations was removed from the data, hence the mean became 45. Find the observation which was removed.
The following table shows the electricity (in units) used by 25 families of Eklara village in a month of May. Complete the table and answer the following questions.
| Electricity used (units) `bb(x_i)` |
No. of Families (frequency) `bb(f_i)` |
`bb(f_ix_i)` |
| 30 | 7 | _________ |
| 45 | 2 | __________ |
| 60 | 8 | __________ |
| 75 | 5 | __________ |
| 90 | 3 | __________ |
| N = _________ | `sum f_ix_i` = ______ |
- How many families use 45 units electricity?
- State the score, the frequency of which is 5.
- Find N, and `sum f_ix_i`
- Find the mean of electricity used by each family in the month of May.
The mean of 5, 9, x, 17 and 21 is 13, then find the value of x
The average of the marks 2, 9, 5, 4, 4, 8, 10 is ____________
The average of two numbers are 20. One number is 24, another number is ____________
Which measures of central tendency get affected if the extreme observations on both the ends of a data arranged in descending order are removed?
The mean of three numbers is 40. All the three numbers are different natural numbers. If lowest is 19, what could be highest possible number of remaining two numbers?
Mean can never be a fraction.
The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the numbers.
In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?
