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प्रश्न
The distribution, given below, shows the marks obtained by 25 students in an aptitude test. Find the mean, median and mode of the distribution.
| Marks obtained | 5 | 6 | 7 | 8 | 9 | 10 |
| No. of students | 3 | 9 | 6 | 4 | 2 | 1 |
उत्तर
| Marks obtained (x) | No. of student (f) | c.f | fx |
| 5 | 3 | 3 | 15 |
| 6 | 9 | 12 | 54 |
| 7 | 6 | 18 | 42 |
| 8 | 4 | 22 | 32 |
| 9 | 2 | 24 | 18 |
| 10 | 1 | 25 | 10 |
| Total | 25 | 171 |
Number of terms = 25
Mean = `171/25` = 6.84
Median = `(25 + 1^("th"))/2 "term"`
= 13th term
= 7
Mode = 6 as it has maximum frequencies i.e. 6
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संबंधित प्रश्न
Calculate the mean of the distribution given below using the shortcut method.
| Marks | 11-20 | 21-30 | 31-40 | 41-50 | 51-60 | 61-70 | 71-80 |
| No. of students | 2 | 6 | 10 | 12 | 9 | 7 | 4 |
If each number given in (a) is diminished by 2, find the new value of mean.
Find the mode of the following data:
9, 11, 8, 11, 16, 9, 11, 5, 3, 11, 17 and 8
Find the mean of all numbers from 7 to 17.
Find the rnedian of the first 15 whole numbers .
Estimate the median, the lower quartile and the upper quartile of the following frequency distribution by drawing an ogive:
| Age( in yrs) | Under 10 | Under 20 | Under 30 | Under 40 | Under 50 | Under 60 |
| No. of males | 6 | 10 | 25 | 32 | 43 | 50 |
The mean of five numbers is 27. If one number is excluded, the mean of the remaining numbers is 25. Find the excluded number.
Find the mean of: 7, 10, 4 and 17
A boy scored the following marks in various class tests during a term, each test being marked out of 20.
15, 17, 16, 7, 10, 12, 14, 16, 19, 12, 16
What is his median marks?
The marks in a subject for 12 students are as follows:
31, 37, 35, 38, 42, 23, 17, 18, 35, 25, 35, 29
For the given data, find the median
