Daily Practice
Foundation
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20th March 2025
- 1Combined Mean
Three groups have 8 items with mean 10, 12 items with mean 15, and 5 items with mean 20. Find the combined mean.
- 2Designing Questionnaires and Surveys
What is wrong with the question 'Do you not think school lunches are too expensive?'
- 3Experimental Design
What is a control group used for?
- 4Median Quartiles and IQR
A data set has Q1 = 22 and Q3 = 35. State the interquartile range and explain what it measures.
- 5Index Numbers
An index number is 140 with a base value of 20. Find this year's value.
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