Advertisements
Advertisements
प्रश्न
The mean of five numbers is 27. If one number is excluded, their mean is 25. Find the
excluded number.
उत्तर
The mean of the numbers 27
The, sum of five numbers = 5 × 27
= 135.
If one number is excluded, then the new mean is 25
∴ Sum of numbers 4× 25 =100
∴Excluded number 135 -100
=35
APPEARS IN
संबंधित प्रश्न
In a mathematics test given to 15 students, the following marks (out of 100) are recorded:-
41, 39, 48, 52, 46, 62, 54, 40, 96, 52, 98, 40, 42, 52, 60
Find the mean, median and mode of this data.
Durations of sunshine (in hours) in Amritsar for first 10 days of August 1997 as reported by
the Meteorological Department are given below: 9.6, 5.2, 3.5, 1.5, 1.6, 2.4, 2.6, 8.4, 10.3, 10.9
(i) Find the mean 𝑋 ̅
(ii) Verify that = `sum _ ( i = 1)^10`(xi - x ) = 0
The mean of 200 items was 50. Later on, it was discovered that the two items were misread
as 92 and 8 instead of 192 and 88. Find the correct mean.
Find the mean of the following distribution:
| x : | 10 | 12 | 20 | 25 | 35 |
| F : | 3 | 10 | 15 | 7 | 5 |
Find the missing frequencies in the following frequency distribution if its known that the mean of the distribution is 50.
| x | 10 | 30 | 50 | 70 | 90 | |
| f | 17 | f1 | 32 | f2 | 19 | Total =120 |
The following observations have been arranged in ascending order. If the median of the data is 63, find the value of x: 29, 32, 48, 50, x, x + 2, 72, 78, 84, 95
If the ratio of mean and median of a certain data is 2:3, then find the ratio of its mode and mean
The mean of n observations is X. If each observation is multiplied by k, the mean of new observations is
The mean of 100 observations is 50. If one of the observations which was 50 is replaced by 150, the resulting mean will be ______.
A football player scored the following number of goals in the 10 matches:
1, 3, 2, 5, 8, 6, 1, 4, 7, 9
Since the number of matches is 10 (an even number), therefore, the median
= `(5^("th") "observation" + 6^("th") "observation")/2`
= `(8 + 6)/2` = 7
Is it the correct answer and why?
