Suppose a ball is drawn from a bag containing 9 red balls numbered 1 through 9 and 3 white balls numbered 10 through 12. Two possible sample spaces for this event are S 1 = { 1 , 2 , 3 , ….. 12 } and S 2 = { R , W } . (a) Which of these sample spaces is equiprobable? What is the probability that (b) the ball is red? (c) the ball is odd-numbered? (d) the ball is white and even-numbered? (e) the ball is white or odd-numbered?
Suppose a ball is drawn from a bag containing 9 red balls numbered 1 through 9 and 3 white balls numbered 10 through 12. Two possible sample spaces for this event are S 1 = { 1 , 2 , 3 , ….. 12 } and S 2 = { R , W } . (a) Which of these sample spaces is equiprobable? What is the probability that (b) the ball is red? (c) the ball is odd-numbered? (d) the ball is white and even-numbered? (e) the ball is white or odd-numbered?
Solution Summary: The author explains that an equiprobable sample space is a space with events that have equal probability. The probability of each event is 112.
Suppose a ball is drawn from a bag containing 9 red balls numbered 1 through 9 and 3 white balls numbered 10 through 12. Two possible sample spaces for this event are
S
1
=
{
1
,
2
,
3
,
…..
12
}
and
S
2
=
{
R
,
W
}
.
(a) Which of these sample spaces is equiprobable? What is the probability that
(b) the ball is red?
(c) the ball is odd-numbered?
(d) the ball is white and even-numbered?
(e) the ball is white or odd-numbered?
Definition Definition For any random event or experiment, the set that is formed with all the possible outcomes is called a sample space. When any random event takes place that has multiple outcomes, the possible outcomes are grouped together in a set. The sample space can be anything, from a set of vectors to real numbers.
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