Which of the following is not an example of a discrete random variable?
a) the number of heads observed for ten coin tosses
b) the mass of an apple randomly chosen from a supermarket bin
c) the sum resulting from the roll of two six-sided dice
d) number of hearts in a randomly chosen hand of seven playing cards
2007-05-18 03:05:23 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Discrete Random Variables
A probability distribution is a table of values showing the probabilities of various outcomes of an experiment.
For example, if a coin is tossed three times, the number of heads obtained can be 0, 1, 2 or 3. A discrete variable is a variable which can only take a countable number of values. In this example, the number of heads can only take 4 values (0, 1, 2, 3) and so the variable is discrete. The variable is said to be random if the sum of the probabilities is one.
2007-05-18 03:11:02 · answer #1 · answered by DanE 7 · 1⤊ 0⤋
probably c, since you have more ways to get 7 than any other number. But I'm not sure that's what discrete random variable means.
2007-05-18 03:09:23 · answer #2 · answered by Goddess of Grammar 7 · 0⤊ 1⤋
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2016-11-24 21:24:42 · answer #3 · answered by pass 3 · 0⤊ 0⤋
b) There is no discrete unit of mass (though, the quantum physicists might disagree).
2007-05-18 03:08:38 · answer #4 · answered by not gh3y 3 · 0⤊ 0⤋
b) because it can be given to unlimited accuracy, e.g. 212.3242334524etc grams.
edit
DanE's answer is better though!
2007-05-18 03:11:48 · answer #5 · answered by joncummins1968 4 · 0⤊ 0⤋
B.
Mass is continuous, not discreet.
2007-05-18 03:10:28 · answer #6 · answered by ryanker1 4 · 0⤊ 1⤋