Daily Practice

Higher

18th August 2025

5 questions · Higher tier · 360 questions in this band

1
Estimated Mean from Grouped Data
The table shows weights, in kg, of 20 parcels: 0-5 (freq 4), 5-10 (freq 10), 10-15 (freq 6). Estimate the mean weight.
2
Sampling Methods
A researcher wants a sample of 50 from a population of 500 using systematic sampling, with a random start of 4. List the first three people selected.
3
Collecting Data
A student uses figures from a government website for her project. Is this primary or secondary data?
4
Comparing Data Sets
Two classes sit the same test. Class P: mean 70, range 10. Class Q: mean 55, range 30. Write a full comparison.
5
Combined Mean
Three groups have 8 items with mean 10, 12 items with mean 15, and 5 items with mean 20. Find the combined mean.

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