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:

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Answer 2

Answer:

9.2

Step-by-step explanation:

Mean of first five observations=(x+x-2+x+4+x-6+x+8)/5=(5x+4)/5

According to problem,

(5x+4)/5=11

=>5x+4=55

=>5x=51

-->x=51/5

Mean of first four observations=(x+x-2+x+4+x-6)/4=(4x-4)/4=x-1=(51/5)-1=46/5=9.2