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If the range of discrete data of n observations is zero, then
A .  all values of data are zero            
B .  all values of data are equal to standard deviation
C .  all values of data are equal
D .  the extreme values of data are different
Answer: Option C
Let m be the least value of the discrete data and M be the maximum value of the discrete data.
Then range = M – m = 0 (hypothesis)
M = m
m each data item M = m
each data item = m or M i.e, all values of the data are equal.

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