Advertisements
Advertisements
प्रश्न
The mean of 4 observations is 20. If one observation is excluded, the mean of the remaining observations becomes 15. Find the excluded observation.
Advertisements
उत्तर
Since mean of 4 observation = 20
⇒ Sum of 4 observation
= 4 x 20
= 80
By excluding one observation,
the mean of the remaining 3 observations = 15
⇒ Sum of remaining 3 observation
= 3 x 15
= 45
∴ Excluded observation
= Sum of 4 observation - Sum of 3 observations
= 80 - 45
= 35.
APPEARS IN
संबंधित प्रश्न
The mean of 15 observations is 32. Find the resulting mean, if the observation is: Decreased by 7
The mean of 18, 24, 15, 2x + 1 and 12 is 21. Find the value of x.
The heights (in cm) of the volleyball players from team A and team B were recorded as:
Team A: 180, 178, 176, 181, 190, 175, 187
Team B: 174, 175, 190, 179, 178, 185, 177
Which team had a greater average height?
Find the median of team A and team B.
The mean of 6 numbers is 42. If one number is excluded, the mean of the remaining number is 45. Find the excluded number.
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.
Find the mean and median of the data: 35, 48, 92, 76, 64, 52, 51, 63 and 71.
If 51 is replaced by 66, what will be the new median?
For the set of numbers given below, find mean: 5, 7, 8, 4, 6
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 increased by 5
The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is decreased by 8
