Advertisements
Advertisements
प्रश्न
The marks obtained by 10 students are listed below:
2, 5, 3, 8, 0, 9, x, 6, 1, 8
If the mean marks is 5, find x.
Advertisements
उत्तर
Mean = `(sumx)/"N"`
= `(2 + 5 + 3 + 8 + 0 + 9 + x + 6 + 1 + 8)/(10)`
= `(42 + x)/(10)`
∴ 5 = `(42 + x)/(10)`
⇒ 50 = 42 + x
⇒ x = 50 - 42 = 8.
APPEARS IN
संबंधित प्रश्न
The mean weight of 60 students in a class is 40 kg. The mean weight of boys is 50 kg while that of girls is 30 kg. Find the number of boys and girls in the class.
The mean of 10 numbers is 24. If one number is included, the new mean is 25. Find the included number.
The mean of x, x + 2, x + 4, x + 6 and x + 8 is 11, find the mean of the first three observations.
For the set of numbers given below, find mean: 5, 7, 8, 4, 6
The height of 8 students X in centimetres are given below:
148, 162, 160, 154, 170, 162, x, 152
If the mean height is 158, find x.
The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is increased by 5
The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is increased by 50%
The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is decreased by 10%
The mean of 200 observations is 20. It is found that the value of 180 is wrongly copied as 280. Find the actual mean.
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 mean marks?
