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Statistics: Numerical Data Intervals

Statistics: Numerical Data Intervals

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Hello, In the module Numerical Variables: Frequency Distribution tables you say that a number is included in the interval if X is strictly greater than lower bound and X is lower or equal to upper bound. However in the example of the video you mention the interval 1 to 21 has a frequency of 2 (1 and 9). Why is 1 included as it is equal (and not greater) to the lower bound?
The same case in the exercice correction (2.4) : first interval is 8 to 54 and includes “8”.
Is it a mistake and that in really X should be greater or equal than lower bound and strictly lower than upper bound?
Furthermore in vague memories from my high school statistics, I was taught to always start the 1st interval at 0 ( 0 to 20, 20 to 40 ect.) so this is wrong? the first interval should start with the lowest value of the dataset?
Thank you for your answers

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