Advertisements
Advertisements
प्रश्न
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 |
उत्तर
| Class |
Class Mark` (x_1)` |
Frequency `f_1` |
`x_1f_1` |
| 0-20 | 10 | 6 | 60 |
| 20-40 | 30 | 4 | 120 |
| 40-60 | 50 | 5 | 250 |
| 60-80 | 70 | 7 | 490 |
| 80-100 | 90 | 3 | 270 |
| 25 | 1190 |
Mean=`(∑x_1f_1)/(∑f_1)`
=`1190/25`
=`47.6`
APPEARS IN
संबंधित प्रश्न
Find the mean of the first five whole numbers.
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.
The data 6, 4, 3, 8, 9, 12, 13, 9 has mean 9.
Solve any two of the following.
In some families in a colony the daily purchase of milk in litre is 1, 3, 2, 2, 4, 1, 2, 2, 1. Find the mean, median and mode of daily purchase of milk.
The number of members in the 40 families in Bhilar are as follows:
1, 6, 5, 4, 3, 2, 7, 2, 3, 4, 5, 6, 4, 6, 2, 3, 2, 1, 4, 5, 6, 7, 3, 4, 5, 2, 4, 3, 2, 3, 5, 5, 4, 6, 2, 3, 5, 6, 4, 2. Prepare a frequency table and find the mean of members of 40 families.
Find the common difference of the A.P 3, 5, 7, ..........
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 set of seven numbers is 81. If one of the numbers is discarded, the mean of the remaining numbers is 78. The value of discarded number is
The algebraic sum of the deviations of a set of n values from their mean is
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
If the mean of five observations x, x + 2, x + 4, x + 6, x + 8, is 11, then the mean of first three observations is
The mean of 5, 9, x, 17 and 21 is 13, then find the value of x
The mean of the square of first 11 natural numbers is
If the average selling price of 15 books is ₹ 235, then the total selling price is __________
The average of the marks 2, 9, 5, 4, 4, 8, 10 is ____________
The mean of first fifteen even numbers is ____________
Find the mean of first 10 prime numbers and first 10 composite numbers
Find the mean of the first ten even natural numbers.
The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the numbers.
