The numbers and are listed as the probabilities of four elementary events of an experiment
MATHEMATICS · Single correct · A Level · Mathematics · Probability · Probability
Problem
The numbers 0.3,0.4,0.2 and 0.3 are listed as the probabilities of four elementary events of an experiment. Which statement correctly explains why this list is NOT a valid probability distribution?
(a) The total probability is less than 1.
(b) The probabilities should be written as common fractions, not decimals.
(c) The total probability is greater than 1.
(d) A valid distribution requires all events to be equally likely; here they are not.