Question

Which of the following is an example of a discrete random variable?
a) length of a car
b) amount of water in a swimming pool
c) weight of a person selected at random
d) number of apples purchased by a random customer at a grocery store

Answer 1

i think it's D

Answer 2

@Zale101 why

Answer 3

Discrete Random variables mean:
A discrete random variable is one which may take on only a countable number of distinct values such as 0,1,2,3,4,........ Discrete random variables are usually (but not necessarily) counts. If a random variable can take only a finite number of distinct values, then it must be discrete. Examples of discrete random variables include the number of children in a family, the Friday night attendance at a cinema, the number of patients in a doctor's surgery, the number of defective light bulbs in a box of ten.
http://www.stat.yale.edu/Courses/1997-98/101/ranvar.htm

So i think D works.

Answer 4

so length of car is not countable?

Answer 5

@aajugdar Assuming that special dimensions are continuous, then the length isn't countable.

Answer 6

well i wanted answer from her but olryt

Answer 7

@aajugdar It matters who the answer comes from?

Answer 8

well
she guessed it @wio
so i was sure she didnt know about it herself
so
well nevermind