If 8 and 13 are the diagonals then it is: 0.5*8*13 = 52 square units
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52 square units
The answer will depend on what DF is!
The answer depends on the degrees of freedom (df). If the df > 1 then the mean is 0, and the standard deviation, for df > 2, is sqrt[df/(df - 2)].
df
DF=