Advertisements
Advertisements
प्रश्न
The mean of three numbers is 10. The mean of other four numbers is 12. Find the mean of all the numbers.
Advertisements
उत्तर
Mean of three numbers = `"Sum of three numbers"/3`
⇒ `10 = "Sum of three numbers"/3` ...[∵ Mean of three numbers = 10, given]
Here, sum of three numbers = 30
Mean of other four numbers = `"Sum of other four numbers"/4`
⇒ `12 = "Sum of other four numbers"/4` ...`[(∵ "Mean of other four"),("numbers" = 12"," "given")]`
Hence, sum of other four numbers = 48
∴ Mean of all the numbers = `"Sum of all the numbers"/"Total numbers"`
= `(["Sum of first three numbers" + "Sum of other four numbers"])/7`
= `(30 + 48)/7`
= `78/7`
= 11.14
Hence, mean of all the numbers is 11.14.
APPEARS IN
संबंधित प्रश्न
The mean of five numbers is 50, out of which mean of 4 numbers is 46, find the 5th number:
Two vessels contain 20 liters and 60 liters of milk respectively. What is the amount that each vessel would have if both share the milk equally?
In a week, temperature of a certain place is measured during winter are as follows 26°C, 24°C, 28°C, 31°C, 30°C, 26°C, 24°C. Find the mean temperature of the week
In a research laboratory scientists treated 6 mice with lung cancer using natural medicine. Ten days later, they measured the volume of the tumor in each mouse and given the results in the table
| Mouse marking | 1 | 2 | 3 | 4 | 5 | 6 |
| Tumor Volume (mm3) | 145 | 148 | 142 | 141 | 139 | 140 |
Find the mean
The marks of 14 students in a science test out of 50 are given below. 34, 23, 10, 45, 44, 47, 35, 37, 41, 30, 28, 32, 45, 39 Find the mean mark
The mean height of 11 students in a group is 150 cm. The heights of the students are 154 cm, 145 cm, Y cm, Y + 4 cm, 160 cm, 151 cm, 149 cm, 149 cm, 150 cm, 144 cm and 140 cm. Find the value of Y and the heights of two students?
If the arithmetic mean of 8, 4, x, 6, 2, 7 is 5, then the value of x is ______.
Mean of the observations can be lesser than each of the observations.
Find the mean of the first ten even natural numbers.
In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?
