Arandom sample size 10 was taken from a population. the sample has a variance of zero. which of the following statements must be true?
i) the population also has a variance of zero.
ii) the sample mean is equal to the sample median.
iii) the ten data points in the sample are equal in numerical value.
a) i only
b) ii only
c) iii only
d) i and ii
e) ii and iii