01:15 – 點解需要量度離差? | why do we need to measure dispersion?03:28 – 分佈域 | range05:02 – 分組數據的分佈域 | range of grouped data08:34 – 四分位數間距 | inter-quartile range13:10 – 分組數據的四分位數間距 | inter-quartile range of grouped data