Statistics

I you are told that a data set has a mean of 25 and a variance of 0 you can conclude that
A)There is only one observation in the data set
B) There are no observations in the data set
C)All of the observation in the data set are 25
D)Someone has made a mistake
E) None of the Above
I picked C am I right

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  1. Correct!

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  2. A set of 50 data value has a mean of 15 and a variance of 36. Find the standard score of a data value = 18

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