If the mean of the first four observations is x+1 , x +3, x+5, and x+7 is 5 . Find the mean of the first three observations.
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Mean, 4
Step-by-step explanation:
It is given that the mean of the first four observations is x+1 , x +3, x+5, and x+7 is 5 .
Mean = Sum of observations/Number of observation
Mean = x+1 + x+3 + x + 5 + x +7/4= 5
Mean = 4x + 16/4 = 5
Mean = 4x + 16 = 20
Mean = x = 1
Now, According to the question's statement!!
Mean of the first three observations = 1+1 + 1+3 + 1+5/ 3
12/3
4
Therefore, the required number is 4.
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