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The second week of the month, days 8 to 14, had the highest temperatures 29, 28, 30, 32, 33, 35, 34…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The second week of the month, days to , had the highest temperatures . Find the mean and the standard deviation.
Need a reminder? The key ideaShow
The month, in degrees Celsius: , , , , , . It rained on days , to and to . 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. Squares. The squared distances from add up to about , so the variance is about .
Step 3. Standard deviation. .
Answer: and . This week swung more than the month as a whole, from rain at the start to the hottest day of the month.
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