A Sample Was Taken of the Metabolic Rates of Men

Multiple Choice

A sample was taken of the metabolic rates of men participating in a study regarding diets. The following boxplot depicts these rates (measured in kilocalories per 24 hours) .
If 25 points were added to each rate, how would the standard deviation of the new distribution of rates change?

A) The standard deviation would increase by 5.
B) The standard deviation would increase by 25.
C) The standard deviation would increase by 625.
D) The standard deviation would remain unchanged.