Math Problem Statement

no use of formula, just combinations: A hotel staff will be loading three different bags to the vehicles of guests Josh, Stell, and Pablo. Unfortunately, the bags do not have their identifications with them and the staff must make a decision on which bag will be loaded to each car. If the random variable X pertains to the number of correct matches the staff makes, determine the probability distribution for the variable X.

Solution

In this problem, we have three different bags, and they need to be loaded into three different vehicles (belonging to guests Josh, Stell, and Pablo). The staff must assign one bag to each guest, and the random variable XX represents the number of correct matches (i.e., the number of bags correctly assigned to their respective owners).

Step 1: Total Number of Possible Assignments

Since each bag can be assigned to one of the three guests, and no bags can be assigned more than once, the total number of ways the staff can assign the bags is:

3!=63! = 6

These 6 assignments (permutations) are:

  • (Josh, Stell, Pablo)
  • (Josh, Pablo, Stell)
  • (Stell, Josh, Pablo)
  • (Stell, Pablo, Josh)
  • (Pablo, Josh, Stell)
  • (Pablo, Stell, Josh)

Step 2: Number of Correct Matches for Each Assignment

We now consider the number of correct matches in each assignment:

  1. (Josh, Stell, Pablo): All bags are correctly matched. Thus, X=3X = 3.
  2. (Josh, Pablo, Stell): Only Josh has the correct bag. Thus, X=1X = 1.
  3. (Stell, Josh, Pablo): Only Stell has the correct bag. Thus, X=1X = 1.
  4. (Stell, Pablo, Josh): Only Pablo has the correct bag. Thus, X=1X = 1.
  5. (Pablo, Josh, Stell): Only Josh has the correct bag. Thus, X=1X = 1.
  6. (Pablo, Stell, Josh): No one has the correct bag. Thus, X=0X = 0.

Step 3: Probability Distribution for XX

Now, we calculate the probability of each value of XX. We count the number of times each value of XX occurs and divide by the total number of possible assignments (which is 6):

  • X=3X = 3 occurs 1 time (out of 6).
  • X=1X = 1 occurs 4 times (out of 6).
  • X=0X = 0 occurs 1 time (out of 6).

Thus, the probability distribution of XX is:

P(X=0)=16,P(X=1)=46,P(X=3)=16P(X = 0) = \frac{1}{6}, \quad P(X = 1) = \frac{4}{6}, \quad P(X = 3) = \frac{1}{6}

Final Answer:

The probability distribution for XX is:

  • P(X=0)=16P(X = 0) = \frac{1}{6}
  • P(X=1)=46P(X = 1) = \frac{4}{6}
  • P(X=3)=16P(X = 3) = \frac{1}{6}

Would you like more details on how this probability distribution is derived, or do you have any other questions? Here are a few related questions you might find interesting:

  1. What is the expected value of XX in this scenario?
  2. How would the distribution change if there were more than three guests and bags?
  3. What is the variance of the number of correct matches XX?
  4. How does the concept of derangements relate to this problem?
  5. What would happen to the probability distribution if there were a rule about bag preferences?

Tip: When solving probability problems with permutations, it's helpful to count the total outcomes first and then classify them into different categories based on the number of correct matches or desired outcomes.

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Math Problem Analysis

Mathematical Concepts

Probability
Permutations
Random Variables

Formulas

3! = 6

Theorems

Permutations
Probability Distribution

Suitable Grade Level

Grades 10-12