EM-3007
Measures of spread
E Math · Secondary 4 · Hard · Measures of spread
A class of 25 students took a Geography test. Their scores have mean 68 and standard deviation 7.
Another student joins the class and scores 68 as well.
What happens to the mean and standard deviation of the 26 scores?
Another student joins the class and scores 68 as well.
What happens to the mean and standard deviation of the 26 scores?
- Mean unchanged; standard deviation decreases.
- Mean increases; standard deviation unchanged.
- Mean decreases; standard deviation increases.
- Both mean and standard deviation unchanged.
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