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Ch. 8 - Sequences, Induction, and Probability
Blitzer - College Algebra 8th Edition
Blitzer8th EditionCollege AlgebraISBN: 9780136970514Non è quello che usi tu?Cambia libro di testo
Capitolo 9, Problema 15

In Exercises 11–16, a die is rolled. Find the probability of getting a number greater than 4.

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Identify the total number of possible outcomes when rolling a standard die. Since a die has 6 faces, the total number of outcomes is \(6\).
Determine the favorable outcomes for the event "getting a number greater than 4." The numbers greater than 4 on a die are \(5\) and \(6\).
Count the number of favorable outcomes. There are \(2\) such numbers: \(5\) and \(6\).
Use the probability formula: \(\text{Probability} = \frac{\text{Number of favorable outcomes}}{\text{Total number of possible outcomes}}\).
Substitute the values into the formula: \(\text{Probability} = \frac{2}{6}\). This fraction can be simplified if needed.

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Concetti chiave

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Sample Space

The sample space is the set of all possible outcomes of an experiment. For a single roll of a standard die, the sample space consists of the numbers {1, 2, 3, 4, 5, 6}. Understanding the sample space is essential to determine the total number of possible outcomes.
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Introduction to Probability

Event

An event is a subset of the sample space that includes outcomes of interest. In this problem, the event is rolling a number greater than 4, which includes the outcomes {5, 6}. Identifying the event helps in calculating the probability.
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Complementary Events

Probability Calculation

Probability is calculated as the ratio of favorable outcomes to the total number of possible outcomes. Here, the probability of rolling a number greater than 4 is the number of favorable outcomes (2) divided by the total outcomes (6), resulting in 2/6 or 1/3.
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Introduction to Probability