Daily Practice

Higher

1st August 2026

5 questions · Higher tier · 360 questions in this band

1
Estimated Mean from Grouped Data
A table has class intervals with frequency x midpoint totals of 45, 120, 90 and frequencies 5, 8, 6. Find the estimated mean.
2
Sampling Methods
A school of 600 students wants a sample of 30. A teacher decides to only survey students in her own class of 30. State one problem with this method.
3
Collecting Data
Give one disadvantage of an observation study.
4
Comparing Data Sets
The mean rainfall in April was 45 mm with a range of 20 mm; in May it was 45 mm with a range of 8 mm. Compare April and May.
5
Combined Mean
Group A has 6 items with mean 15. Group B has 9 items with mean 25. Find the combined mean.

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