Math Problem Statement

From the figure, what is P(X > 1.6) or P(X < 0.12)?

Solution

The question is about a uniform distribution of a random variable XX, and you are asked to find the probability P(X>1.6)P(X > 1.6) or P(X<0.12)P(X < 0.12) from the given uniform distribution over the interval [0, 2].

For a uniform distribution over an interval [a,b][a, b], the probability density function (PDF) is given by:

f(x)=1baf(x) = \frac{1}{b - a}

Here, a=0a = 0 and b=2b = 2, so the PDF is:

f(x)=120=12f(x) = \frac{1}{2 - 0} = \frac{1}{2}

The probability of XX being in any subinterval is simply the length of that subinterval multiplied by the PDF. Thus, to compute the probabilities:

  1. P(X>1.6)P(X > 1.6):

The length of the interval [1.6,2][1.6, 2] is:

21.6=0.42 - 1.6 = 0.4

So, the probability is:

P(X>1.6)=0.4×12=0.2P(X > 1.6) = 0.4 \times \frac{1}{2} = 0.2

  1. P(X<0.12)P(X < 0.12):

The length of the interval [0,0.12][0, 0.12] is:

0.120=0.120.12 - 0 = 0.12

So, the probability is:

P(X<0.12)=0.12×12=0.06P(X < 0.12) = 0.12 \times \frac{1}{2} = 0.06

  1. For P(X>1.6)P(X > 1.6) or P(X<0.12)P(X < 0.12):

Since these two events are mutually exclusive (they can't happen at the same time), you can add the probabilities:

P(X>1.6 or X<0.12)=P(X>1.6)+P(X<0.12)=0.2+0.06=0.26P(X > 1.6 \text{ or } X < 0.12) = P(X > 1.6) + P(X < 0.12) = 0.2 + 0.06 = 0.26

Thus, the final answer is 0.26.

Would you like more details or have any questions? Here are some related questions to consider:

  1. How do we calculate the probability for a uniform distribution over different intervals?
  2. What are the properties of a uniform distribution?
  3. Can uniform distributions be discrete or only continuous?
  4. How would the probability change if the interval for XX were different, like [0,3][0, 3]?
  5. What are some real-world applications of uniform distributions?

Tip: Always visualize the interval on the number line for uniform distributions to better understand the probabilities associated with different regions.

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Math Problem Analysis

Mathematical Concepts

Probability
Uniform Distribution

Formulas

PDF = 1/(b - a)
P(X > a) = (b - a) * PDF
P(X < a) = (a - 0) * PDF

Theorems

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Suitable Grade Level

College