Math Problem Statement

From the figure, what is P(X ≥ 1.82)?

Solution

The problem involves a uniform distribution between X=0X = 0 and X=2X = 2, and you're asked to find P(X1.82)P(X \geq 1.82).

Step-by-Step Solution:

  1. Understanding Uniform Distribution:

    • A uniform distribution means the probability is evenly distributed across the interval. The probability density function (PDF) of a uniform distribution between aa and bb is: f(x)=1baf(x) = \frac{1}{b - a} Here, a=0a = 0 and b=2b = 2, so: f(x)=120=12f(x) = \frac{1}{2 - 0} = \frac{1}{2}
  2. Calculate the Required Probability:

    • You're asked to find P(X1.82)P(X \geq 1.82). This is the area under the PDF curve from X=1.82X = 1.82 to X=2X = 2, which is a simple proportion of the total interval.
    • The length of the interval from 1.82 to 2 is: 21.82=0.182 - 1.82 = 0.18
    • The probability of being in this interval is: P(X1.82)=length of interval×height of PDF=0.18×12=0.09P(X \geq 1.82) = \text{length of interval} \times \text{height of PDF} = 0.18 \times \frac{1}{2} = 0.09

Thus, P(X1.82)=0.09P(X \geq 1.82) = 0.09.

Would you like further details on this?

Here are 5 related questions for further practice:

  1. What is P(X1.5)P(X \geq 1.5) for the same uniform distribution?
  2. How would the probability change if the interval were [0,3][0, 3] instead of [0,2][0, 2]?
  3. What is the probability that XX is between 0.5 and 1.5?
  4. How do you calculate the expected value of a uniform distribution?
  5. What is the variance of XX in a uniform distribution between aa and bb?

Tip: The area under the curve in a uniform distribution always represents probability!

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Math Problem Analysis

Mathematical Concepts

Probability
Uniform Distribution

Formulas

P(X ≥ a) = (b - a) * f(x) for a uniform distribution where f(x) = 1 / (b - a)

Theorems

Uniform Distribution Probability

Suitable Grade Level

Grades 10-12