Advertisements
Advertisements
प्रश्न
Find the mean and the median of: 10,12, 12, 15, 15, 17, 18, 18, 18 and 19
उत्तर
Given data: 10,12, 12, 15, 15, 17, 18, 18, 18 and 19
Here, number of terms = 10 which is even
∴ Median =`1/2 {"n"/2 "th term" + ("n"/2 + 1)"th term"}`
`= 1/2 {10/2 "th term" + (10/2 + 1) "th term"}`
`= 1/2 {5 "th term" + 6 "th term"}`
`= 1/2 {15 + 17}`
`= 1/2 xx 32 = 16`
∴ Median = 16
Mean = `"Sum of observations"/"Number of observations"`
`= (10 + 12 + 12 + 15 + 15 + 17 + 18 + 18 + 18 + 19)/10`
`= 154/10 = 15.4`
APPEARS IN
संबंधित प्रश्न
The following table gives the heights of plants in centimeter. If the mean height of plants is 60.95 cm; find the value of 'f'.
| Height (cm) | 50 | 55 | 58 | 60 | 65 | 70 | 71 |
| No. of plants | 2 | 4 | 10 | f | 5 | 4 | 3 |
Using the information given in the adjoining histogram, calculate the mean.
A boy scored 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 and 16
What are his modal marks?
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 the following frequency distribution :
| Class | 1-10 | 11-20 | 21-30 | 31-40 | 41-50 |
| Frequency | 9 | 12 | 15 | 10 | 14 |
Find the mode of the following:
20, 20, 30, 30, 30, 30, 35, 40, 40, 45, 45, 45, 50, 55, 60, 60, 60 ,65, 70, 70, 70
Height (in cm) of 7 boys of a locality are 144 cm, 155 cm, 168 cm, 163 cm, 167 cm, 151 cm and 158 cm. Find their mean height.
The median of the data 24, 29, 34, 38, 35 and 30, is ___________
Find the median of 25, 16, 15, 10, 8, 30
Find the median of first nine even natural numbers.
