Question

Q12. If the mean of five observations x, X+2, X+4, X+6, X+8 is 11 find the mean of first three observation. * O (a) 9 O (b) 11 O (c) 13 O (d) none of these​

Answer 1

Step-by-step explanation

110

Hope it helps to u

Answer 2

Answer:

None of these

Step-by-step explanation:

if { x+(x+2)+(x+4)+(x+6)+x(+8)}/ 5 = 11

5x + 20 = 55

5x = 35

x= 7

first three numbers are : 7 , 9 , 11

mean = (7+9+11)/3

mean =27/3

mean = 9

so the answer is none of these