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An experiment involves rolling a pair of dice, 1 white and 1 red, and recording the numbers that come up. Find the probability a) that the sum is greater than 8 b) that a number greater than 4 appears on the white die c) that at most a total of 5 appears.

Short Answer

Expert verified
a) \(\frac{5}{18}\), b) \(\frac{1}{3}\), c) \(\frac{5}{18}\).

Step by step solution

01

Determine Possible Outcomes

First, determine the total number of possible outcomes when rolling two dice. Each die has 6 faces, so there are \(6 \times 6 = 36\) possible outcomes.
02

Calculate Probability for Sum Greater Than 8

List all the combinations where the sum of the dice is greater than 8: (3,6), (4,5), (4,6), (5,4), (5,5), (5,6), (6,3), (6,4), (6,5), (6,6). There are 10 combinations. The probability is \(\frac{10}{36} = \frac{5}{18}\).
03

Calculate Probability for Number Greater Than 4 on White Die

Examine the cases where the white die shows a number greater than 4. This includes when the white die shows 5 or 6. For each case (5 and 6), there are 6 possibilities (since the red die can show 1 through 6). This results in \(2 \times 6 = 12\) favorable outcomes. The probability is \(\frac{12}{36} = \frac{1}{3}\).
04

Calculate Probability for At Most a Total of 5

Enumerate combinations where the sum is at most 5: (1,1), (1,2), (1,3), (1,4), (2,1), (2,2), (2,3), (3,1), (3,2), (4,1). Count these, resulting in 10 ways. The probability is \(\frac{10}{36} = \frac{5}{18}\).

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Key Concepts

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

Outcomes in Dice Rolls
When rolling two dice, one white and one red, understanding the possible outcomes is crucial. Each die has 6 faces, from 1 to 6. A pair of dice, therefore, has a total of 36 unique outcomes.
To visualize this, think of a grid where each row represents a face of the white die, and each column represents a face of the red die. Each cell in the grid corresponds to one of the possible outcomes of the dice roll. For example, a result of 2 on the white die and 5 on the red die is written as (2,5).
This grid method enables us to easily see all possible results, helping us identify outcomes for various probability scenarios. Such outcomes are the groundwork for any probability calculations.
Calculating Probabilities
Probability refers to the likelihood of a specific event occurring amongst all possible outcomes. It's calculated using the formula: \[Probability = \frac{\text{Number of Favorable Outcomes}}{\text{Total Possible Outcomes}}.\]Consider finding the probability that the sum of the dice is greater than 8. First, list all outcomes where the sum exceeds 8: (3,6), (4,5), (4,6), (5,4), (5,5), (5,6), (6,3), (6,4), (6,5), and (6,6). These are 10 outcomes.
Using the formula, the probability is \[\frac{10}{36} = \frac{5}{18}.\]Understanding how probabilities are calculated helps in analyzing different situations, like checking if a white die shows a number greater than 4. With 12 favorable outcomes out of 36, this probability is \[\frac{12}{36} = \frac{1}{3}.\]
Conditional Probability Concepts
Conditional probability focuses on the probability of an event given that another event has already occurred. This concept is crucial when analyzing scenarios with dependent events.
However, in independent events like our dice rolls, conditional probability isn't directly used because each roll is unaffected by the previous one. Yet, understanding this concept is essential as it guides deeper probability discussions.
For example, if you're interested in finding if the total is at most 5, the conditional aspect doesn't play a direct role here, but being aware that such conditions can exist enriches your overall probability toolkit. You focus on understanding the specific combinations that yield a sum of 5 or less and calculate their probability: 10 combinations lead to a \[\frac{10}{36} = \frac{5}{18}\]chance. This approach demonstrates how probability calculations can remain straightforward or evolve into more complex analyses when conditions are introduced.

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Most popular questions from this chapter

Fill in the missing entries in the following table.. $$\begin{array}{|l|l|l|l|l|l|} \hline \mathrm{P}(A) & \mathrm{P}(B) & \text { Conditions for events } A \text { and } B & \mathrm{P}(A \cap B) & \mathrm{P}(A \cup B) & \mathrm{P}(A | B) \\\ \hline 0.3 & 0.4 & \text { Mutually exclusive } & & & \\ \hline 0.3 & 0.4 & \text { Independent } & & & \\ \hline 0.1 & 0.5 & & & 0.6 & \\ \hline 0.2 & 0.5 & & 0.1 & & \\ \hline \end{array}$$

Nigel is a student at Wigley College and lives in the dorms. To avoid coming late to his morning classes he usually sets his alarm clock. \(85 \%\) of the time he manages to remember and set his alarm. When the alarm goes off he manages to go to his morning classes \(90 \%\) of the time. If the alarm is not set, he still manages to get up and go to class on \(60 \%\) of the days. a) What percentage of the days does he manage to get to his morning classes? b) He made it to class one day. What is the chance that he did that without having set the alarm?

Marco plays tennis. In this game, a player has two 'serves! If the first serve is successful, the game continues. If the first serve is not successful, the player is given another chance. If the second serve fails, then the player loses the point. Marco is successful with his first serve \(60 \%\) of the time and \(95 \%\) successful with his second serve. When his first serve is successful he goes on to win the point \(75 \%\) of the time, and when it takes him two serves, he wins the point \(50 \%\) of the time. a) What is the probability that Marco wins the point? b) If Marco wins a point, what is the probability that he succeeded with the first serve?

You are playing with an ordinary deck of 52 cards by drawing cards at random and looking at them. a) Find the probability that the card you draw is (i) the ace of hearts (ii) the ace of hearts or any spade (iii) an ace or any heart (iv) not a face card. b) Now you draw the ten of diamonds, put it on the table and draw a second card. What is the probability that the second card is (i) the ace of hearts? (ii) not a face card? c) Now you draw the ten of diamonds, return it to the deck and draw a second card. What is the probability that the second card is (i) the ace of hearts? (ii) not a face card?

You are collecting data on traffic at an intersection for cars leaving a highway. Your task is to collect information about the size of the vehicle: truck \((7),\) bus \((B)\) car (C). You also have to record whether the driver has the safety belt on (SH or no safety belt (SN), as well as whether the headlights are on (O) or off ( \(F\) ). a) List the outcomes of your sample space, U. b) List the outcomes of the event SY that the driver has the safety belt on. c) List the outcomes of the event \(C\) that the vehicle you are recording is a car. d) List the outcomes of the event in \(C \cap S Y, C\), and \(C \cup S Y\).

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