Question

If the mean of 4 numbers 2, 6, 7 and “a” is 15 and also mean of other 5 numbers 6,
18, 1, a, b is 50. What is the value of ‘b’.

Answer 1

Duniya beimaan na hai hum hi khatarnaak h …

Answer 2

Step-by-step explanation:

mean= 2+6+7+a

—————. =15

4

2+6+7+a= 15×4

15+a = 60

a= 60-15

.

a= 45. ––( i )

6+18+1+a+b

—————. = 50

4

25+45+b

————— = 50. (a= 45. in i )

4

70+b

––·–. = 50. 70+b= 200

4

b= 130