Advertisements
Advertisements
Question
Using the information given in the adjoining histogram, calculate the mean.
Solution
| C.I. | Frequency | Mid value x | fx |
| 15 – 25 | 10 | 20 | 200 |
| 25 – 35 | 20 | 30 | 600 |
| 35 – 45 | 25 | 40 | 1000 |
| 45 – 55 | 15 | 50 | 750 |
| 55 – 65 | 5 | 60 | 300 |
| Total | 75 | 2850 |
`barx = (sumf_x)/(sumf)`
= `2850/75`
= 38
APPEARS IN
RELATED QUESTIONS
Find the mean, median and mode of the following marks obtained by 16 students in a class test marked out of 10 marks:
0, 0, 2, 2, 3, 3, 3, 4, 5, 5, 5, 5, 6, 6, 7 and 8.
The monthly income of a group of 320 employees in a company is given below:
| Monthly income (thousands) | No. of employees |
| 6-7 | 20 |
| 7-8 | 45 |
| 8-9 | 65 |
| 9-10 | 95 |
| 10-11 | 60 |
| 11-12 | 30 |
| 12-13 | 5 |
Draw an ogive of the distribution on a graph paper taking 2 cm = Rs. 1000 on one axis and 2 cm = 50 employees on the other axis. From the graph detemine:
- the median wage.
- number of employee whose income is below Rs. 8,500.
- If salary of a senior employee is above Rs. 11,500, find the number of senior employee in the company.
- the upper quartile.
Find the mean of all numbers from 7 to 17.
Find the mode of the following frequency distribution:
| Pocket money per week in Rs | 25 | 50 | 75 | 100 | 125 | 150 |
| No. of students | 4 | 7 | 13 | 18 | 6 | 2 |
Find the median of 5, 7, 9, 11, 15, 17, 2, 23 and 19.
The heights (in cm) of 8 girls of a class are 140, 142, 135, 133, 137, 150, 148 and 138 respectively. Find the mean height of these girls and their median height.
Find the mean of: 12, 9, 6,11 and 17
Find the median of the following sets of numbers.
15, 8, 14, 20, 13, 12, 16
In a given data, arranged in ascending or descending order, the middle most observation is called ______.
The median of the following observations arranged in ascending order is 64. Find the value of x:
27, 31, 46, 52, x, x + 4, 71, 79, 85, 90
