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Have only one number in your data set. Because the range would take the highest and lowest numbers, the only way for the range to be all the same number is if you have only number in the set. With only one number, the mean, median, and mode will all be the same number as well.
It means that the variance remains the same across the range of values of the variable.
Mean: 50.6 Median: 42 Range: 85 Mode: None (all numbers occur with same frequency)
No, literacy is a topic, an education covers a wide range of topics.