Daily Practice

Foundation

15th November 2024

5 questions · Foundation tier · 282 questions in this band

1
Conditional Probability (Foundation)
A drawer has 7 black socks and 5 white socks. Two socks are taken without replacement. Find P(second sock is black given the first sock was black).
2
Estimating from Samples (Foundation)
A survey of 30 shoppers out of 900 in a store found the mean amount spent was 18.50 pounds. What is the best estimate of the mean amount spent by all 900 shoppers?
3
Spreadsheets and ICT (Foundation)
Which spreadsheet formula would you use to find the total of the values in cells B2 to B20?
4
Stratified Sampling (Foundation)
A population of 90 people is split into 3 age groups: 30 aged 18 to 30, 40 aged 31 to 50, and 20 aged 51 or over. A stratified sample of 27 is needed. Find how many from the 51-or-over group should be sampled.
5
Pilot Surveys (Foundation)
A tick-box question has the options '0-10', '10-20', '20-30'. What problem would a pilot survey likely identify with this?

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