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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=
17/2 = 8.5 (where EN touches DF)Using Pythagoras...172 - 8.52 = 216.75Square root of 216.7 = 14.7