Igcse Model Questions Vol1 2022 Mathematics Question 25
Practice objective / multiple choice question 25 from the 2022 Igcse Model Questions Vol1 Mathematics examination.
The following frequency distribution gives the ages (in years) of participants in a survey. The class mid‑points are shown in parentheses. | Age interval (mid‑point) | Frequency | | 0-9 (4.5) | 5 | | 10-19 (14.5) | \(a\) | | 20-29 (24.5) | 12 | | 30-39 (34.5) | 9 | | 40-49 (44.5) | 4 | The mean age of the whole group is \(24.5\) years. (i) Determine the value of the unknown frequency \(a\). (ii) Using this value, calculate the standard deviation of the distribution, giving your answer to one decimal place.
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This is Igcse Model Questions Vol1 2022 Mathematics Question 25. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Mathematics examination.
Difficulty level: Hard .
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