20 points and ! three dentists wanted to compare the ages of their patients. they each calculated their patients’ mean age and the mean absolute deviation of their ages. they displayed the results in a table.

which statements are true?

select each correct answer. you can pick more than one answer

a. dr. appiah’s patients’ ages vary more than do dr. cantwell’s patients’ ages.

b. dr. appiah’s patients’ ages vary less than do dr. singh’s patients’ ages.

c. dr. singh’s patients’ ages and dr. appiah’s patients’ ages vary about the same amount.

d. dr. cantwell’s patients’ ages and dr. singh’s patients’ ages vary about the same amount.