statement; check all that are true.
a) The standard deviation will be equal to 0 only if all the observations in a data
set are equal.
b) For right-skewed distributions, the mean is typically greater than the median.
c) Boxplots are typically used to illustrate the shape of a distribution, whereas
histograms are best used to compare two or more groups.
d) Q2 is always exactly halfway between Q₁ and Q3.