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91Ó°ÊÓ

Fifty-two percent of the students at a certain college are females. Five percent of the students in this college are majoring in computer science. Two percent of the students are women majoring in computer science. If a student is selected at random, find the conditional probability that (a) the student is female given that the student is majoring in computer science; (b) this student is majoring in computer science given that the student is female.

Short Answer

Expert verified
a) The conditional probability that the student is female, given they are majoring in computer science is 40% (\(P(A|B) = 0.4\)). b) The conditional probability that a student is majoring in computer science, given they are female is approximately 3.846% (\(P(B|A) \approx 0.03846\)).

Step by step solution

01

Identify Events

In this problem, we have two events: Event A: The student is female. Event B: The student is majoring in computer science. We are given \(P(A) = 0.52\), \(P(B) = 0.05\), and \(P(A \cap B) = 0.02\). We will use this information to find the conditional probabilities. ##Step 2: Calculate the probability that the student is female given they are majoring in computer science##
02

Find \(P(A|B)\)

Using the formula for conditional probability, we can find the probability that a student is female, given they are majoring in computer science: \(P(A|B) = \frac{P(A \cap B)}{P(B)}\) Substitute the given probabilities: \(P(A|B) = \frac{0.02}{0.05}\) Now, divide the probabilities: \(P(A|B) = 0.4\) So, the conditional probability that the student is female, given they are majoring in computer science is 40%. ##Step 3: Calculate the probability that a student is majoring in computer science given they are female##
03

Find \(P(B|A)\)

Now, we need to find the probability that a student is majoring in computer science given they are female. We can use the formula for conditional probability again: \(P(B|A) = \frac{P(A \cap B)}{P(A)}\) Substitute the given probabilities: \(P(B|A) = \frac{0.02}{0.52}\) Now, divide the probabilities: \(P(B|A) = \frac{1}{26}\) \(P(B|A) \approx 0.03846\) So, the conditional probability that a student is majoring in computer science given they are female is approximately 3.846%. In summary: a) The probability that the student is female, given they are majoring in computer science is 40%. b) The probability that a student is majoring in computer science, given they are female is approximately 3.846%.

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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 branch of mathematics that deals with quantifying the likelihood of different outcomes. It is integral to a wide range of fields, from finance and science, to everyday decision making.

Consider a simple example: flipping a coin. We know that there are two possible outcomes—heads or tails. If the coin is fair, the probability of it landing on heads is equal to the probability of it landing on tails, which is 0.5 or 50%.

In more complex scenarios, such as the one in our original exercise dealing with conditional probability, we are concerned with the likelihood of an event occurring given that another event has occurred. This is where conditional probability comes into play, defined as the probability of an event (A), given that another event (B) has already occurred.

The formula for conditional probability is:
\[P(A|B) = \frac{P(A \cap B)}{P(B)}\]
where:\begin{itemize}\item\(P(A|B)\) is the conditional probability of A given B;\item\(P(A \cap B)\) is the probability of both A and B occurring; and\item\(P(B)\) is the probability of B occurring.\end{itemize}
Using this formula, students can solve a variety of real-world problems, grappling with probability in scenarios from gambling to weather forecasting, and importantly, in understanding data trends in fields like computer science and education demographics.
Majoring in Computer Science
Choosing a major in college is an important decision that can influence a student's career path and earning potential. Computer science is a popular and lucrative field focusing on the theoretical foundations of information and computation.

Students majoring in computer science learn about algorithms, software and hardware design, and the processing of digital information. As our world becomes increasingly digitized, the demand for skilled computer science professionals continues to grow, making it a sought-after degree.

Despite its popularity, the field of computer science still grapples with issues of diversity and inclusion. Exercises on conditional probability, like the one explored in this article, mirror real challenges in educational demographics and gender representation in the computer science domain. While these exercises help students learn the mathematical concepts, they also subtly expose them to sociological aspects within the field of study.

Understanding the dynamics of who is entering the computer science field, from a probability standpoint, can also inform measures to balance gender representation, ensuring a diversity of perspectives is contributing to the advancements of technology.
Gender Demographics in Education
Gender demographics in education shed light on the representation of different genders across various fields of study and levels of education. This topic deals with statistical distributions and trends that can have significant socio-economic implications.

Historically, there have been disparities in gender representation within certain academic disciplines. For instance, fields like nursing and education have traditionally seen higher female enrollment, whereas engineering and computer science have been male-dominated. However, recent efforts in promoting STEM (Science, Technology, Engineering, and Mathematics) to underrepresented genders have started to shift these demographics.

The original exercise can serve as an educative reflection on such gender demographics. By calculating the conditional probability of a student being female and majoring in computer science, educators can reinforce not only the math skills but also the awareness of gender diversity—or lack thereof—in this particular field.

There is a considerable push in educational policy to balance these demographics, with scholarship programs and targeted outreach initiatives. The goal is to eliminate gender bias and ensure that all students have equal opportunities and encouragement to pursue any field of their choice, ultimately leading to a more diverse and inclusive workforce.

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Most popular questions from this chapter

A worker has asked her supervisor for a letter of recommendation for a new job. She estimates that there is an 80 percent chance that she will get the job if she receives a strong recommendation, a 40 percent chance if she receives a moderately good recommendation, and a 10 percent chance if she receives a weak recommendation. She further estimates that the probabilities that the recommendation will be strong, moderate, and weak are .7, .2 and .1, respectively. (a) How certain is she that she will receive the new job offer? (b) Given that she does receive the offer, how likely should she feel that she received a strong recommendation? a moderate recommendation? a weak recommendation? (c) Given that she does not receive the job offer, how likely should she feel that she received a strong recommendation? a moderate recommendation? a weak recommendation?

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