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. dr. appiah’s patients’ ages vary more than do dr. cantwell’s patients’ ages. dr. cantwell’s patients’ ages and dr. singh’s patients’ ages vary about the same amount. dr. singh’s patients’ ages and dr. appiah’s patients’ ages vary about the same amount. dr. appiah’s patients’ ages vary less than do dr. singh’s patients’ ages. dentist mean patient age mad appiah 43 9.7 cantwell 29 13.9 singh 41 14.1

the answer   is 200

step-by-step explanation:

this is a problem about poisson probabilities.   i don't know if you've

already studied poisson distributions, or if you have a place to look

to read more about the subject.  

here's how you can see a poisson distribution coming.   when there are

a lot of events that may happen at any time (or any place), and when

you're counting how many of them happen at a particular time (or a

particular place), and each event is independent of the others, then

the result is a poisson distribution.   this is roughly true for the

chocolate chips; one chip being in a cookie has only a small effect on

the probability that another chip will be in the cookie.

once you know you have a poisson distribution, you know a lot.   there

is only one parameter to a poisson distribution, so if you know the

mean, you know everything.   the form of the distribution is

  probability of n chips = {[e^(-x)]*(x^n)} / (n! )

you can not drow on this

step-by-step explanation: