unallocated means not assigned but it still doesn't answer the real question how is a number calling you that isn't assigned to anybody or company
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It could mean that the number you dialed is not valid. A number can be invalid for many reasons:Too many/few numbers dialed.Incorrect area codeIncorrect country codeNot in exsistance/issuedand many more
You incorporate the fractional remainder into the mean. The mean does not have to be a whole number.
TE
A single number cannot have a mean - other than itself. To calculate a mean, you need more than a single number.
The average of a single number is equal to the number itself. In this instance, the mean of the number 6 is 6.