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Determine whether each of the following sets of events is mutually exclusive. a. Five coins are tossed: "no more than one head is observed," "two heads are observed," "three or more heads are observed." b. A salesperson calls on a client and makes a sale: the amount of the sale is "less than \(\$ 100\)," is "between \( 100\) and \(\$ 1000, "\) is "more than \(500\)." c. One student is selected at random from the student body: the person selected is "female," is "male," is "older than \(21 . "\) d. Two dice are rolled: the numbers of dots showing on the dice are "both odd," "both even," "total 7" "total 11."

Short Answer

Expert verified
a) Mutually Exclusive, b) Not Mutually Exclusive, c) Not Mutually Exclusive, d) Mutually Exclusive

Step by step solution

01

Set A Analysis

In the first set, the events are 'no more than one head is observed,' 'two heads are observed,' and 'three or more heads are observed.' These events are mutually exclusive because they cannot occur at the same time. If there are exactly two heads, it is impossible to observe more than one head nor can there be three or more heads.
02

Set B Analysis

In the second set, the events are 'the amount of the sale is less than \(\$100\),' 'is between \(\$100\) and \(\$1000\),' 'is more than \(\$500\).' These events are not mutually exclusive because they can occur at the same time. For example, a sale can be between \(\$100\) and \(\$1000\), which still makes it more than \(\$500\). So these two events can occur together, hence they are not mutually exclusive.
03

Set C Analysis

In the third set, the events are 'the person selected is female,' 'is male,' 'is older than \(21\).' These events are not mutually exclusive because they can occur together. For example, a person can be both male and older than \(21\), or female and older than \(21\). So these events are not mutually exclusive.
04

Set D Analysis

In the fourth set, the events are 'the numbers of dots showing on the dice are both odd,' 'both even,' 'total 7,' 'total 11.' These events are mutually exclusive because they cannot occur at the same time. If the numbers on the dice are both odd, they can't total 7 or 11, nor be both even. Therefore, these events are mutually exclusive.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Probability Theory
Probability theory is a mathematical framework for quantifying the likelihood of various outcomes in experiments or processes. It plays a crucial role in statistics, mathematics, and a wide range of scientific disciplines. For example, when throwing a die, probability theory helps us determine the chances of rolling a specific number.

Within this framework, the concept of mutually exclusive events is fundamental. Mutually exclusive events are those that cannot occur at the same time. Take the tossing of a coin: the events of getting 'heads' and 'tails' are mutually exclusive, as the coin cannot land on both sides simultaneously. Understanding whether events are mutually exclusive is key to calculating probabilities correctly because if two events are mutually exclusive, the probability of both occurring is zero.
Statistical Independence
Statistical independence is another cornerstone concept in probability theory. Events are considered statistically independent if the occurrence of one event does not affect the probability of the occurrence of another event. For example, when tossing two coins, the outcome of one toss does not influence the outcome of the other; they are independent events.

Understanding whether events are independent is crucial for calculating probabilities, as the probability of independent events occurring together is the product of their individual probabilities. This is not the case if events are not independent. It's important to realize that mutual exclusivity and independence are not the same thing. Events can be mutually exclusive without being independent, such as the scenarios presented in the exercise. Identifying whether events are independent is a vital step in determining the correct approach to probability computations.
Combinatorial Analysis
Combinatorial analysis is a field of mathematics focused on counting, arranging, and combining elements within sets, usually in finite terms. It forms the foundation for determining the number of possible outcomes in probability and helps us understand complex problems by breaking them down into manageable parts.

Relating to our exercise, combinatorial analysis would come into play when considering the number of ways in which a student could be selected based on gender and age or the different combinations of dots that can appear on two rolled dice. By calculating these combinations, we can further deduce the probabilities of each event occurring. Crucial techniques in combinatorial analysis include the use of permutations and combinations, which help in understanding events with multiple possible outcomes, like the rolling of dice in part (d) of the exercise.

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Most popular questions from this chapter

A bowl contains four kinds of identical-looking, foilwrapped, chocolate egg- shaped candies. All but 50 of them are milk chocolate, all but 50 are dark chocolate, all but 50 are semi-sweet chocolate, and all but 60 are white chocolate. a. How many candies are there in the bowl? b. How many of each kind of chocolate are in the bowl? c. If one chocolate is selected at random, what is the probability that it is white chocolate? d. If one chocolate is selected at random, what is the probability that it is white or milk chocolate? e. If one chocolate is selected at random, what is the probability that it is milk and dark chocolate? f. If two chocolates are selected at random, what is the probability that both are white chocolate? g. If two chocolates are selected at random, what is the probability that one is dark and one is semisweet chocolate? h. If two chocolates are selected at random, what is the probability that neither is milk chocolate?

One student is selected at random from a group of 200 students known to consist of 140 full-time \((80 \text { female and } 60 \text { male })\) students and 60 part-time (40 female and 20 male) students. Event \(A\) is "the student selected is full time," and event \(\mathrm{C}\) is "the student selected is female." a. Are events \(A\) and \(C\) independent? Justify your answer. b. Find the probability \(P(\mathrm{A} \text { and } \mathrm{C}\) ).

Tires salvaged from a train wreck are on sale at the Getrich Tire Company. Of the 15 tires offered in the sale, 5 have suffered internal damage and the remaining 10 are damage free. You randomly selected and purchased two of these tires. a. What is the probability that the tires you purchased are both damage free? b. What is the probability that exactly one of the tires you purchased is damage free? c. What is the probability that at least one of the tires you purchased is damage free?

A traffic analysis at a busy traffic circle in Washington, DC, showed that 0.8 of the autos using the circle entered from Connecticut Avenue. Of those entering the traffic circle from Connecticut Avenue, 0.7 continued on Connecticut Avenue at the opposite side of the circle. What is the probability that a randomly selected auto observed in the traffic circle entered from Connecticut and will continue on Connecticut?

One student is selected at random from a student body. Suppose the probability that this student is female is 0.5 and the probability that this student works part time is \(0.6 .\) Are the two events "female" and "working part time" mutually exclusive? Explain.

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