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Variance or mean deviation of a given frequency table

This type of question, asked 2 times: 30 Jan 2024, 5 Apr 2026 S1. All 2 questions below, oldest first.

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  1. Question 1

    30 Jan 2024

    180
    The variance σ2\sigma^{2} of the data
    xix_{i}0156101217
    fif_{i}3232633
    is

  2. Question 2

    5 Apr 2026 S1

    58
    The mean deviation about the mean for the data
    xix_{i}579101215
    fif_{i}862226
    is equal to :

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