Distribution X and Distribution Y have the same mean. Both distributions are symmetrical, but Distribution X is more variable than distribution Y. Given this information, we can correctly conclude that
a. X's variance is less than Y's variance.
b. X's standard deviation is greater than Y's standard deviation.
c. both distributions must have the same standard deviation.
d. Y's standard deviation is greater than X's standard deviation.
e. One cannot conclude any of the above without more information.
Ans: b
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