Which of the ff statements is true?

Group of answer choices

a. A normal distribution behavior shows both characteristic of right skewed and flat.

b. None of the statements are true.

c. The mode of a data is not necessarily unique nor always existent

d. The range maximizes the data given by using each point to compute for a measure of dispersion.

e. The variance is the squared difference of each data point from the median divided by the degrees of freedom (which is number of data less 1).