Advertisements
Advertisements
प्रश्न
The mean of a set of numbers is `bar(X)`. If each number is multiplied by z, the mean is
विकल्प
`bar(X) + z`
`bar(X) - z`
`zbar(X)`
`bar(X)`
Advertisements
उत्तर
`zbar(X)`
Explanation;
Hint:
If each observation is multiplied by k, k ≠ 0 then the arithmetic mean is also multiplied by the same quantity.
APPEARS IN
संबंधित प्रश्न
The` "n"^(th)` term of the A. P. 3, 8, 13, 18, ............ is 148. Find n
The mean of 35 observations is 20, out of which mean of first 18 observations is 15 and mean of last 18 observation is 25. Find the 18th observation.
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.
If the average selling price of 15 books is ₹ 235, then the total selling price is __________
_______________ is a representative value of the entire data
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 a data is defined as ______.
Mean of the data is always from the given data.
The following are weights (in kg) of 12 people. 70, 62, 54, 57, 62, 84, 75, 59, 62, 65, 78, 60. How many people weigh above the mean weight?
