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A positive and negative number with the same magnitude (value) will have their absolute values equal.
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If "the number" is the subject of a sentence or clause, the verb in the same sentence or clause should be singular in form, but if "a number" is the subject of a sentence or clause, the verb in the same sentence or clause should be plural in form. The rationale supporting this rule is that the phrase "the number" implies that only one number is being considered, but "a number" implies that more than one number is likely.
Yes, you mark the end of a sentence in the same way.
The Mean is the average of a given set of values. The Median is the value that has the same number of smaller values than the number of higher values, it is in the middle of them. In a symmetrical distribution the Mean is equal to the Median. In an asymmetrical distribution they have different value.