Question: 2. When constructing a frequency table with equal intervals of a continuous variable X, each interval consists of same width. To make sure that there

2. When constructing a frequency table with equal intervals of a continuous variable X, each interval consists of same width. To make sure that there is no overlap between two adjacent intervals, each interval actually includes 1. lower limit < X < upper limit.

2. lower limit ≤ X < upper limit.

3. lower limit < X ≤ upper limit.

4. lower limit ≤ X ≤ upper limit.

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