Advertisements
Advertisements
प्रश्न
Find the mean of first 10 prime numbers and first 10 composite numbers
Advertisements
उत्तर
First 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
Mean = `"Sum of all data"/"Number of data"`
= `(2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29)/10`
= `129/10`
Mean = 12.9
Mean of first 10 prime numbers = 12.9
First 10 composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18
Mean = `(4 + 6 + 8 + 9 + 10 + 12 + 14 + 15 + 16 + 18)/10`
= `112/10`
= 11.2
Mean of first 10 composite numbers = 11.2
APPEARS IN
संबंधित प्रश्न
The enrolment in a school during six consecutive years was as follows:
1555, 1670, 1750, 2013, 2540, 2820
Find the mean enrolment of the school for this period.
Solve any two of the following.
Find the mean of the data given in the following table.
| Class | 0-20 | 20-40 | 40-60 | 60-80 | 80-100 |
| Frequency | 6 | 4 | 5 | 7 | 3 |
Mean of 100 observations is 40. The 9th observation is 30. If this is replaced by 70 keeping all other observations same, find the new mean.
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 weight of 4 members of a family is 60 kg. Three of them have the weight 56 kg, 68 kg and 72 kg respectively. Find the weight of the fourth member
The mean of a, b, c, d and e is 28. If the mean of a, c and e is 24, then mean of b and d 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?
If the arithmetic mean of 8, 4, x, 6, 2, 7 is 5, then the value of x is ______.
Mean of the data is always from the given data.
