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 −2, 2, 3, 4, and 6.

Solution

To complete the probability distribution for the random variable XX, we need to ensure two conditions for the probabilities:

  1. The sum of all probabilities must equal 1.
  2. Each probability must be non-negative.

Given the table:

Value xx of XXP(X=x)P(X = x)
-20.10
20.18
3?
40.11
6?

Step 1: Set up the equation for the total sum of probabilities.

The total must sum to 1, so:

0.10+0.18+P(X=3)+0.11+P(X=6)=10.10 + 0.18 + P(X=3) + 0.11 + P(X=6) = 1

Step 2: Solve for the sum of P(X=3)+P(X=6)P(X = 3) + P(X = 6).

0.10+0.18+0.11=0.390.10 + 0.18 + 0.11 = 0.39 P(X=3)+P(X=6)=10.39=0.61P(X = 3) + P(X = 6) = 1 - 0.39 = 0.61

Step 3: Distribute the remaining probability.

This leaves P(X=3)+P(X=6)=0.61P(X = 3) + P(X = 6) = 0.61. Without further constraints, one possible solution is to assign equal probabilities:

P(X=3)=0.305andP(X=6)=0.305P(X = 3) = 0.305 \quad \text{and} \quad P(X = 6) = 0.305

This would create a valid probability distribution.

Would you like more details on how to adjust this or have any specific questions?

Here are 5 follow-up questions related to probability distributions:

  1. What is a probability distribution, and how is it defined for discrete variables?
  2. How do you verify if a given set of probabilities forms a valid distribution?
  3. How can you find the expected value (mean) of a discrete random variable?
  4. What is the significance of the variance and standard deviation in probability distributions?
  5. How can probability distributions be applied in real-world scenarios, such as decision-making?

Tip: When solving probability questions, always ensure the total sum of probabilities equals 1, and each individual probability must be between 0 and 1.

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Math Problem Analysis

Mathematical Concepts

Probability Distribution
Discrete Random Variable
Probability Theory

Formulas

Sum of probabilities must equal 1

Theorems

Probability distribution properties

Suitable Grade Level

Grades 9-12