SME
Grade 7 Math · Problem type
Sample means vary
Use this for “Many samples of 30 apples each give a mean weight. What does the spread of the means say?”
Record and look
0
20
40
3
18
40
30
9
140–147
148–155
156–163
164–171
172–179
140–147
148–155
156–163
164–171
172–179
Count (samples)
3
18
40
30
9
More sample means fall in 156–163 grams than anywhere else (40 of 100), so the population mean is probably near there.
Tap a bar at the height you want.
Assumptions
•
Each sample of 30 apples gives a mean weight, in grams.
•
The bars count how many samples had a mean in each interval.
•
Different samples give different means, but most land near the population mean.
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