Math Problem Statement

Fill in the P(X=x) values to give a legitimate probability distribution for the discrete random variable X , whose possible values are 0,3,4,5, and 6.

Solution

To complete the table and make it represent a legitimate probability distribution, the sum of all probabilities P(X=x)P(X = x) must equal 1.

Given:

  • P(X=0)=0.23P(X = 0) = 0.23
  • P(X=5)=0.23P(X = 5) = 0.23
  • P(X=6)=0.27P(X = 6) = 0.27

Let the missing values be P(X=3)=p1P(X = 3) = p_1 and P(X=4)=p2P(X = 4) = p_2.

The total probability should sum to 1:

0.23+p1+p2+0.23+0.27=10.23 + p_1 + p_2 + 0.23 + 0.27 = 1

Simplifying, we get:

p1+p2+0.73=1p_1 + p_2 + 0.73 = 1

p1+p2=0.27p_1 + p_2 = 0.27

Now, the values of p1p_1 and p2p_2 must be non-negative and add up to 0.27. A simple solution could be:

p1=0.13andp2=0.14p_1 = 0.13 \quad \text{and} \quad p_2 = 0.14

So, the completed table is:

\hline \text{Value } x \text{ of } X & P(X = x) \\ \hline 0 & 0.23 \\ 3 & 0.13 \\ 4 & 0.14 \\ 5 & 0.23 \\ 6 & 0.27 \\ \hline \end{array}$$ Would you like more details on the calculations or have any other questions? --- Here are some related questions: 1. How do you calculate the mean (expected value) for this discrete probability distribution? 2. What is the cumulative distribution function (CDF) for the variable $$X$$ in this distribution? 3. Can you explain how to calculate the variance of $$X$$ for this distribution? 4. What would change in the distribution if $$P(X = 6)$$ were instead 0.20? 5. How can this distribution be interpreted in a real-world scenario? 6. What other checks can be done to verify if a distribution is valid? 7. If you wanted to add a new possible value $$X = 2$$ to the distribution, how would that affect the probabilities? 8. What are the implications of having two probabilities be exactly equal in a distribution? **Tip:** When distributing probabilities, ensure that the sum of the assigned probabilities equals 1 and that each individual probability is non-negative and does not exceed 1.

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Math Problem Analysis

Mathematical Concepts

Probability Theory
Discrete Random Variables

Formulas

Probability Distribution
Sum of Probabilities

Theorems

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Suitable Grade Level

Undergraduate