5) The mean of observations x, x + 2, x + 4, x + 6 and x + 8 is 22
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Step-by-step explanation:
mean = sum of all the observation divided by no. of observation
= x+ x+2 + x + 4 x + 6 + x + 8 = 22
= 5x + 20 = 22
= 5x= 22- 20
= x = 2/5
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18, 20, 22, 24, 26
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