Math Problem Statement

1000 randomly sampled graduates from ABC University were asked whether they had confidence in getting a job. A graduate is selected at random, find the probability that the graduate selected is: (1) confidence in getting a job, (2) confidence in getting a job given that she is female. Also, are the events 'No confidence in getting a job' (N) and 'Male' (M) mutually exclusive?

Solution

Let's go through the questions one by one based on the table provided.

Table Summary:

  • Total Graduates = 1000 (350 Male, 650 Female)
  • Confidence (Yes) = 575 (225 Male, 350 Female)
  • No Confidence (No) = 425 (125 Male, 300 Female)

(i) A graduate is selected at random, find the probability that the graduate selected is:

1. Confidence in getting a job

To find the probability that a randomly selected graduate has confidence in getting a job: P(Confidence in getting a job)=Total graduates with confidenceTotal graduates=5751000=0.575P(\text{Confidence in getting a job}) = \frac{\text{Total graduates with confidence}}{\text{Total graduates}} = \frac{575}{1000} = 0.575 So, the probability is 0.575.

2. Confidence in getting a job given that she is female

This is a conditional probability problem. We want to find P(ConfidenceFemale)P(\text{Confidence} | \text{Female}), which is the probability that a graduate has confidence given that the graduate is female. P(ConfidenceFemale)=Number of females with confidenceTotal number of females=350650=0.538P(\text{Confidence} | \text{Female}) = \frac{\text{Number of females with confidence}}{\text{Total number of females}} = \frac{350}{650} = 0.538 So, the probability is 0.538.

(ii) Are the events ‘No confidence in getting a job’ (N) and ‘Male’ (M) mutually exclusive? Justify your answer.

Two events are mutually exclusive if they cannot happen at the same time, i.e., their intersection is empty.

From the table:

  • The number of males who have no confidence in getting a job is 125.
  • Since there are male graduates who have no confidence, these events are not mutually exclusive.

Justification: There are 125 males who have no confidence, so the two events NMN \cap M are not empty.


Would you like more details or have any questions?

Here are 5 related questions:

  1. What is the probability that a randomly selected graduate is female and has confidence in getting a job?
  2. What is the probability that a randomly selected graduate is male and has no confidence in getting a job?
  3. How would you calculate the probability that a randomly selected graduate is either male or has confidence in getting a job?
  4. What does it mean for two events to be independent, and are the events "Confidence in getting a job" and "Male" independent?
  5. What is the probability that a randomly selected male graduate has no confidence in getting a job?

Tip: When solving probability problems involving conditional probabilities, always remember to narrow the sample space to the condition being given (in this case, gender).

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Probability
Conditional Probability
Mutually Exclusive Events

Formulas

P(Confidence in getting a job) = Total graduates with confidence / Total graduates
P(Confidence | Female) = Number of females with confidence / Total number of females
Mutually exclusive events: Two events are mutually exclusive if they cannot happen at the same time.

Theorems

Probability Theorem
Conditional Probability Theorem

Suitable Grade Level

Grades 9-12