Measures of central tendency and spread

Measures of central tendency and spread Quiz

Spec L3 · AQA A-Level Maths: Quiz

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  1. 1. Which of 6, 8, 8, 11, 17 is the mean?

    • A. 8
    • B. 10
    • C. 11
    • D. 9.5

  2. 2. n=10n=10, ∑x=50\sum x=50, ∑x2=290\sum x^2=290. Find the variance.

    • A. 29
    • B. 5
    • C. 4
    • D. 2

  3. 3. A data set has standard deviation 3. What is its variance?

    • A. 1.73
    • B. 9
    • C. 6
    • D. 3

  4. 4. Which pair of measures is affected least by an extreme value?

    • A. mean and range
    • B. mean and standard deviation
    • C. range and variance
    • D. median and interquartile range

  5. 5. Five values have ∑x=40\sum x=40 and ∑x2=340\sum x^2=340. A sixth value of 8 is added. What is the new mean?

    • A. 8
    • B. 7
    • C. 9
    • D. 6.67

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