If the mean of the observation x,2x-1,2x+5,2x+9 is 30, what is the mean I the last two observations.
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mean=x+2x-1+2x+5+2x+9/4
120=7x+13
120-13=7x
107/7=x
15.28=x
120=7x+13
120-13=7x
107/7=x
15.28=x
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