Daily Practice

Foundation

29th September 2024

5 questions · Foundation tier · 282 questions in this band

1
Conditional Probability (Foundation)
A class has 12 boys and 8 girls. One student, a girl, leaves the room. A second student is then chosen at random from those remaining. Find P(second student chosen is a girl given the first was a girl).
2
Estimating from Samples (Foundation)
A sample of 25 students from a school of 500 found that 5 walk to school. Estimate how many of all 500 students walk to school.
3
Spreadsheets and ICT (Foundation)
A column of 8 test scores is in cells D2 to D9. Give the formula for the mean score.
4
Stratified Sampling (Foundation)
A researcher wants a stratified sample of 30 from a population of 300 split into three regions: North (90 people), South (150 people) and East (60 people). She actually samples 9 from the North, 14 from the South and 7 from the East. Show whether her sample is correctly stratified, stating the correct numbers if not.
5
Pilot Surveys (Foundation)
What is a pilot survey?

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