Question

12. The mean of six numbers : X - 5, X - 1, X, X + 2, X + 4 and x + 12 is 15. Find the
mean of first four numbers.​

Answer 1

Step-by-step explanation:

x-5+x-1+x+x+2+x+4+x+12/6=15

6x+12=15×6

6x+12=90

6x=90-12

6x=78

x=78/6

x=13

means of first four numbers is

x-5+x-1+x+x+2

x=13(from above solution)

13-5+13-1+13+13+2

48