Advertisements
Advertisements
प्रश्न
If the mean of 7, 16, 9, 15, 16, a, 12, 8, b, 11 is 12, write a in terms of b.
Advertisements
उत्तर
Mean = `(sumx)/"N"`
= `(7 + 16 + 9 + 15 + 16 + "a" + 12 + 8 + "b" + 11)/(10)`
∴ 12 = `(94 + "a" + "b")/(10)`
⇒ 120 = 94 + a + b
⇒ a = 120 - 94 - b = 26 - b
∴ a = 26 - b.
APPEARS IN
संबंधित प्रश्न
Find the mean of x + 3, x + 5, x + 7, x + 9 and x + 11.
The mean of 15 observations is 32. Find the resulting mean, if each observation is: Multiplied by 2
A boy scored the following marks in various class tests during a terminal exam, each test being marked out of 20.
17, 15, 16, 7, 10, 14, 12, 19, 16, 12
Find his average mean marks.
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.
A test out of 25 marks was given to 16 students and marks scored are recorded below:
25, 8, 14, 20, 16, 22, 10, 15, 8, 7, 24, 18, 19, 6, 11, 14
Find the mean marks
A test out of 25 marks was given to 16 students and marks scored are recorded below: 25, 8, 14, 20, 16, 22, 10, 15, 8, 7, 24, 18, 19, 6, 11, 14
In the report, marks were entered out of 50. What is the mean of the recorded marks in the report?
In History project, marks out of 20 were awarded to 8 students. The marks were as shown below:
14, 16, 18, 14, 16, 14, 12, 16
Find the mean marks.
The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is decreased by 10%
The mean of 4 observations is 20. If one observation is excluded, the mean of the remaining observations becomes 15. Find the excluded observation.
The mean of 200 observations is 20. It is found that the value of 180 is wrongly copied as 280. Find the actual mean.
