Math Problem Statement

From the uniform distribution of a random variable X given in the figure, what is P(X > 0.72)?

Solution

The problem shows a uniform distribution of a random variable XX between 0 and 2. A uniform distribution has a constant probability density function (PDF) over its range.

For a uniform distribution over the interval [a,b][a, b], the probability density function is: f(x)=1baf(x) = \frac{1}{b - a} where a=0a = 0 and b=2b = 2, so: f(x)=12f(x) = \frac{1}{2}

The probability P(X>0.72)P(X > 0.72) can be calculated by determining the fraction of the interval from 0.720.72 to 2. Since XX is uniformly distributed, the probability is proportional to the length of the interval.

The length of the interval from 0.720.72 to 2 is: 20.72=1.282 - 0.72 = 1.28

The total length of the distribution's interval is 20=22 - 0 = 2. Therefore, the probability is: P(X>0.72)=1.282=0.64P(X > 0.72) = \frac{1.28}{2} = 0.64

Thus, the probability that X>0.72X > 0.72 is 0.640.64.

Do you have any further questions or need additional details?

Here are some related questions for further exploration:

  1. What is the cumulative distribution function (CDF) of a uniform distribution?
  2. How would you calculate P(X<1.5)P(X < 1.5) for this distribution?
  3. What is the expected value E(X)E(X) for this uniform distribution?
  4. How do you find the variance of a uniform distribution over the interval [0, 2]?
  5. How does the probability change if the range of the uniform distribution was [0,4][0, 4]?

Tip: In a uniform distribution, probabilities are proportional to the length of the intervals within the distribution's support.

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Math Problem Analysis

Mathematical Concepts

Probability
Uniform Distribution

Formulas

Probability density function for uniform distribution: f(x) = 1 / (b - a)
Calculation of probability in uniform distribution: P(X > x) = (b - x) / (b - a)

Theorems

Uniform Distribution Theorem

Suitable Grade Level

Grades 11-12, Undergraduate Statistics