Advertisements
Advertisements
प्रश्न
The mean of a, b, c, d and e is 28. If the mean of a, c and e is 24, then mean of b and d is
पर्याय
24
36
26
34
Advertisements
उत्तर
34
Explanation;
Hint:
Mean = 28
a + b + c + d + e = 28 × 5 = 140
= 140 ...(1)
But `("a" + "c" + "e")/3` = 24
a + c + e = 72
a + b + c + d + e = 140
b + d + 72 = 140
b + d = 140 – 72
= 68
Mean = `68/2`
= 34
APPEARS IN
संबंधित प्रश्न
The enrolment in a school during six consecutive years was as follows:
1555, 1670, 1750, 2013, 2540, 2820
Find the mean enrolment of the school for this period.
Solve any two of the following.
In some families in a colony the daily purchase of milk in litre is 1, 3, 2, 2, 4, 1, 2, 2, 1. Find the mean, median and mode of daily purchase of milk.
The mean of 35 observations is 20, out of which mean of first 18 observations is 15 and mean of last 18 observation is 25. Find the 18th observation.
Two vessels contain 20 liters and 60 liters of milk respectively. What is the amount that each vessel would have if both share the milk equally?
The mean of 5, 9, x, 17 and 21 is 13, then find the value of x
The mean of the square of first 11 natural numbers is
The mean of first ten natural numbers is ____________
Arithmetic mean of 15 observations was calculated as 85. In doing so an observation was wrongly taken as 73 for 28. What would be correct mean?
Find the mean of the first ten even natural numbers.
In a class of 100 students there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average of the girls?
