4.3 Measures of central tendency and dispersion

4.3 Measures of central tendency and dispersion Quiz

IB Maths: Applications and Interpretation HL: Quiz

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5 questions, one answer each

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1. Find the mean of $4,6,6,8,11$ .
- A. 6
- B. 6.5
- C. 7
- D. 8
2. Two classes have frequencies: $0\le x<10$ : 2 and $10\le x<20$ : 3. Estimate the mean.
- A. 11
- B. 10
- C. 5.5
- D. 15
3. A data set has mean 12 and standard deviation 3. Each value is doubled and then 1 is subtracted. What are the new mean and standard deviation?
- A. 12 and 3
- B. 23 and 3
- C. 24 and 6
- D. 23 and 6
4. The standard deviation of a data set is 2.5. What is the variance?
- A. 2.5
- B. 6.25
- C. 1.58
- D. 5
5. Classes of equal width have frequencies $7,12,15,6$ for $0\le x<5$ , $5\le x<10$ , $10\le x<15$ , $15\le x<20$ . What is the modal class?
- A. $0\le x<5$
- B. $5\le x<10$
- C. $10\le x<15$
- D. $15\le x<20$