Advertisements
Advertisements
प्रश्न
Find the mean of: first six even natural numbers
उत्तर
The first six even natural numbers are 1 = 2, 4, 6, 8, 10, 12
∴ Sum of these observations = 2, 4, 6, 8, 10, 12 = 42
and, number of their observations = 6
∴ Required mean = `42/6 = 7`
APPEARS IN
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 69.5 is the mean of 72, 70, ‘x’, 62, 50, 71, 90, 64, 58 and 82, find the value of ‘x’.
The following are the marks obtained by 70 boys in a class test:
| Marks | No. of boys |
| 30 – 40 | 10 |
| 40 – 50 | 12 |
| 50 – 60 | 14 |
| 60 – 70 | 12 |
| 70 – 80 | 9 |
| 80 – 90 | 7 |
| 90 – 100 | 6 |
Calculate the mean by:
Short-cut method
Using the information given in the adjoining histogram, calculate the mean.
The mean of a certain number of observations is 32. Find the resulting mean, if the observation is decreased by 20%.
The mean of five numbers is 27. If one number is excluded, the mean of the remaining numbers is 25. Find the excluded number.
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 mean of five positive integers is twice their median. If four of the integers are 3, 4, 6, 9 and median is 6, then find the fifth integer
Find the median of the given data:
14, −3, 0, −2, −8, 13, −1, 7
Median of the data may or may not be from the given data.
