I think it means circa, meaning around or approximately that date. It is used a lot in the early years when exact dates are not known.
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Well, isn't that a happy little question! To find five numbers with a mean of 9, we can simply choose numbers that add up to 45 (5 numbers multiplied by the mean of 9). For example, we could have 6, 7, 8, 10, and 14. Remember, in the world of numbers, there are no mistakes, just happy little accidents!
Even Numbers mean that they are like not odd and are in the 2 times tables. An even number can be evenly divided by 2.
The mean is like the average, all of the numbers in a data set added up and divided buy the number of numbers in the data set.
It means that the number is negative. Negative numbers are always under 0.
You cannot. Suppose the mean of a set of numbers is m. Now add the pair of numbers m-x and m+x to the set, where x is any number. The new, extended set will have the same mean as before but two more members.