Question

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

Step-by-step explanation:

1)x=5

2)x=1

3)x=-2

4)+4

Answer 2

Answer:

12

Step-by-step explanation:

((x - 5) + (x – 1) + (x) + (x +2) + (x + 4) + (x + 12))/6

= (x – 5 + x – 1 + x + x + 2 + x + 4 + x + 12)/6

= (12 + 6x)/6 = 15

= 12 + 6x = 90

= 6x = 90 – 12

= 6x = 78

= x = 78/6 = 13

x = 13

(13 – 5), (13 – 1), 13, (13 + 2), (13 + 4), (13 + 12)

i.e. 8, 12, 13, 15, 17, 25

= (8 + 12 + 13 + 15)/4 = 48/4 = 12