The less-than sign alone means "less than"; if there is a line below, it means "less than or equal".
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A line under the greater than symbol means, "greater than or equal to" and can also be represented by ">=" on the keyboard.
If by "arrow" you mean "carat" (>) the carat means "greater than" and if underlined means "greater than or equal to"
There is no such number. For if you considered 49.99 to be such a number, then 49.995 is a greater number and it is less than 50. And then 49.9955 is even greater and still less than 50. This process can go on without end.
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An* outlier is a number that is much, much greater or much, much less than all/most of the other points. Basically the one that messes up the average, so usually outliers are counted out when finding the mean of a set.