Advertisements
Advertisements
Question
The mean of 15 observations is 32. Find the resulting mean, if the observation is: Decreased by 20%
Advertisements
Solution
Given that the mean of 15 observations is 32
resulting mean decreased by 20%
= 32 - `( 20 ) / (100 ) xx 32 `
= 32 - 6.4
= 25.6
APPEARS IN
RELATED QUESTIONS
The mean of 15 observations is 32. Find the resulting mean, if the observation is: Divided by 0.5
Find the mean of 8, 12, 16, 22, 10 and 4. Find the resulting mean, if each of the observations, given above, be: decreased by 40%
The average of n numbers x1, x2, x3 ….. xn is A. If x1 is replaced by ( x+ α )x1, x2, is replaced by ( x+ α )x2 and so on.
Find the new average.
The mean of x, x + 2, x + 4, x + 6 and x + 8 is 11, find the mean of the first three observations.
The weight of the seven members of a family, in kilograms are given below:
20, 52, 56, 72, 64, 13, 80.
Find mean weight.
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.
If the mean of 7, 16, 9, 15, 16, a, 12, 8, b, 11 is 12, write a in terms of b.
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
Each of the above students was 2 extra marks for submitting the project a week before the due date. What is the revised mean of this group?
The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is multiplied by 4
The mean of 4 observations is 20. If one observation is excluded, the mean of the remaining observations becomes 15. Find the excluded observation.
