/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 23 A bag contains 40 cards numbered... [FREE SOLUTION] | 91Ó°ÊÓ

91Ó°ÊÓ

A bag contains 40 cards numbered 1 through 40 that are either red or blue. A card is drawn at random and placed back in the bag. This is done four times. Two red cards are drawn, numbered 22 and 7 . Your friend concludes that red cards and even numbers must be mutually exclusive. Is your friend correct? Explain.

Short Answer

Expert verified
No, friend is not correct. The event of drawing a red card and the event of drawing an even-numbered card are not mutually exclusive, as demonstrated by the fact that a red card with an even number (22) was drawn.

Step by step solution

01

Understanding Mutually Exclusive Events

A mutual exclusive event in probability refers to the situation where if one event happens, another cannot happen. In other words, these are events that can't occur at the same time. In the context of this problem, saying the red cards and even numbers are mutually exclusive means that a card can't be both red and an even number.
02

Evaluate the Statement Based on the Events

The cards mentioned are Number 22 (an even number) and a red card and Number 7 (an odd number) and a red card. This means a card can be a red card and an even numbered card (22) at the same time. Therefore, the assertion that red cards and even numbers are mutually exclusive is not correct.
03

Provide the Explanation

Because an event occurred where a card was both red and an even number (22), it contradicts the definition of mutually exclusive events. If red cards and even numbers were mutually exclusive, no card could be both red and even. However, as demonstrated by the card number 22, this is not the case.

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Key Concepts

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

Probability
Probability is a way of expressing the likelihood that a certain event will occur. It is usually given as a number between 0 and 1, where 0 indicates an impossibility, and 1 indicates certainty. For example, when flipping a fair coin, the probability of it landing on heads is \(0.5\) because there are two equally likely outcomes. In the context of drawing cards from a bag, each card has an equal chance of being drawn if the selection is random. The exercise deals with calculating the probability of drawing red cards and even-numbered cards. This requires an understanding of how to calculate the likelihood of individual and combined events. Understanding probability helps students make predictions about outcomes and assess the randomness of events in a quantitative way.
Even and Odd Numbers
Understanding even and odd numbers is crucial in mathematics, as they form the basis for many rules and patterns. An even number is any integer that is divisible by two, which means it can be split into two equal groups without any remainder. Conversely, an odd number is not divisible by two and has a remainder of 1 when divided by 2. In practice, this means that even numbers end with 0, 2, 4, 6, or 8, while odd numbers end with 1, 3, 5, 7, or 9. This exercise required the student to identify the parity of given numbers (even or odd) and assess the erroneous claim about mutually exclusive events using this understanding.
Probability for Dependent Events
When dealing with dependent events, the outcome or occurrence of the first event affects the outcome or probability of the second event taking place. However, in our original exercise, the concept of dependent events isn't directly applied as each card is placed back in the bag after being drawn, maintaining a constant probability for each subsequent draw. This is contrary to scenarios where, for instance, a card was kept out of the bag, thereby changing the total number of outcomes for the next draw. It is important to differentiate between dependent and independent events to accurately calculate probabilities and understand the exercise correctly.
Mathematical Reasoning
Mathematical reasoning involves making logical deductions and connecting facts to reach a conclusion. It is a critical skill in not only mathematics but also in everyday decision-making. The problem presented required the use of mathematical reasoning to deduce that the claim about red cards and even numbers being mutually exclusive was incorrect. To do this, a student must be able to understand the definitions involved and apply them to the observed scenario. Logical reasoning also assists in demonstrating why mutually exclusive events cannot occur together, as shown by the example of drawing a red card that is also an even number. Developing mathematical reasoning skills is vital for students when solving problems and understanding mathematical concepts deeply.

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