Advertisements
Advertisements
प्रश्न
The mean of a, b, c, d and e is 28. If the mean of a, c, and e is 24, What is the mean of band d?
पर्याय
31
32
33
34
उत्तर
Given that the mean of a, b, c, d and e is 28. They are 5 in numbers.
Hence, we have
`(a +b+c+d+e)/5 =28`
`⇒((a +c+e)+(b+d))/5=28`
`⇒(a+c+e)/5 +(b+d)/5 = 28`
But, it is given that the mean of a, c and e is 24. Hence, we have
`⇒(a+c+e)/3 =24`
`⇒a+c+e+=72`
Then, we have
`72/5 + (b+d)/5 =28`
`⇒(b+d)/5 =28 -72/5`
`⇒(b+d)/5 = 28-14.4`
`⇒(b+d)/5 = 13.6`
`⇒b+d = 68`
`⇒(b+d)/2 =68/2`
`⇒(b+d)/2 = 34`
Hence, the mean of b and d is 34 .
APPEARS IN
संबंधित प्रश्न
Find the mean of first five natural numbers .
The mean of marks scored by 100 students was found to be 40. Later on it was discovered
that a score of 53 was misread as 83. Find the correct mean.
The mean weight of 8 numbers is 15. If each number is multiplied by 2, what will be the new mean?
If x is the mean of the ten natural numbers `x_1, x_2 , x_3+....... + x_10` show that (x1 -x) + (x2 - x) +.........+ (x10 - x)` = 0
The weights (in kg) of 15 students are: 31, 35, 27, 29, 32, 43, 37, 41, 34, 28, 36, 44, 45, 42,30. Find the median. If the weight 44 kg is replaced by 46 kg and 27 kg by 25 kg, find the new median.
Mark the correct alternative in each of the following:
Which one of the following is not a measure of central value?
If the mean of the following data is 20.2, then find the value of p.
| xi | 10 | 15 | 20 | 25 | 30 |
| fi | 6 | 8 | p | 10 | 6 |
If `barx` is the mean of x1, x2, ..., xn, then for a ≠ 0, the mean of `ax_1, ax_2, ..., ax_n, x_1/a, x_2/a, ..., x_n/a` is ______.
Mode of the data 15, 14, 19, 20, 14, 15, 16, 14, 15, 18, 14, 19, 15, 17, 15 is ______.
The points scored by a basket ball team in a series of matches are as follows:
17, 2, 7, 27, 25, 5, 14, 18, 10, 24, 48, 10, 8, 7, 10, 28
Find the median and mode for the data.
