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Find the variance and the standard deviation of 4, 6, 7, 9, 14.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Find the variance and the standard deviation of .
Need a reminder? The key ideaShow
Standard deviation: find each distance from the mean, square it, take the mean of the squares (the variance), then the square root.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Mean. .
Step 2. Distances and squares. , with squares .
Step 3. Variance. .
Step 4. Standard deviation. .
Answer: variance , standard deviation .
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