(a)
To calculate: Explain why the probability model for X is not binomial.
X can take on more than 2 values.
Given information:
X =Number of points on a card draw.
Formula used:
Here, E is the favourable outcomes and S is the total possible outcomes.
Calculation:
The four conditions for a binomial setting are:
Binary (success/failure), independent trials, fixed number of trials and probability of success is the same for each trial.
Binary: Not satisfied, because X can take on values from 0 to 10 and thus X can take on more than 2 values (while a binary random variable can only take on 2 values).
Independent trials: Satisfied, because one card is drawn from a standard deck of cards and is thus not affected by other draws.
Fixed number of trials: Satisfied, because we draw 1 card and thus the fixed number of trials is 1.
Probability of success: Satisfied, because there is a
Since the binary condition is not satisfied, the given scenario does not describe a binomial setting.
(b)
To calculate: A random variable that would have a binomial probability model.
Answer could vary.
Given information:
Draw one card from a deck.
Formula used:
Here, E is the favourable outcomes and S is the total possible outcomes.
Calculation:
First define a random variable with relation to drawing cards from a deck of cards such that the random variable is binomial.
For example,
Let us consider the random variable:
Y =Number of aces among 10 draws from a standard deck of cards, where a card is returned to the deck of card before the next card is drawn.
The four conditions for a binomial setting are:
Binary (success/failure), independent trials, fixed number of trials and probability of success is the same for each trial.
Binary: Satisfied,
Because Success=Ace and Failure=Not ace.
Independent trials: Satisfied, because 10 cards are drawn from a standard deck of cards with replacement and thus a draw is not affected by other draws.
Fixed number of trials: Satisfied, because we draw 10 cards and thus the fixed number of trials is 10.
Probability of success: Satisfied, because there is a
Since all 4 conditions are satisfied, the given scenario describes a binomial setting.
Answers could vary.
Chapter 10 Solutions
PRECALCULUS:GRAPHICAL,...-NASTA ED.
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