Question
A sample of $n=7$ scores has a mean of $M=9$. One score in the sample is changed from $X=19$ to $X=5$. What is the value for the new sample mean?
Step 1
Since the mean ($M$) of the scores is given as 9 and there are $n=7$ scores, the total sum ($S$) of the scores can be calculated by multiplying the mean by the number of scores: \[ S = M \times n = 9 \times 7 = 63. \] Show more…
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