Question

if the mean of 5observation are x,x-2,x+4,x-6 and x+8 is 11 find the mean of first 4 observation​

Answer 1

Answer:

9.2

Step-by-step explanation:

(x+x-2+x+4+x-6+x+8)/5=11

5x+4=55

x=51/5=10.2

for first 4

(36.8)/4=9.2