using the discrete RV X whose CDF is given below, B = x*0.58, mathematically describe the PMF of (B) , what is P[B<2.1] ? and what is the standard deviation of σ[B]?
using the discrete RV X whose CDF is given below, B = x*0.58, mathematically describe the PMF of (B) , what is P[B<2.1] ? and what is the standard deviation of σ[B]?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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using the discrete RV X whose CDF is given below, B = x*0.58, mathematically describe the PMF of (B) , what is P[B<2.1] ? and what is the standard deviation of σ[B]?

Transcribed Image Text:The image depicts a step function, which represents the cumulative distribution function (CDF) of a discrete random variable \( X \). The function is denoted as \( F_X(x) \).
### Graphical Explanation:
- **Axes:**
- The horizontal axis (x-axis) represents the variable \( x \).
- The vertical axis (y-axis) corresponds to \( F_X(x) \), the value of the cumulative distribution function.
- **Function Characteristics:**
- The graph is composed of horizontal line segments, indicating a step-wise increase in the function value at discrete points on the x-axis.
- The horizontal segments represent the probability mass at specific values of \( x \).
- The function starts at \( F_X(1) = 0 \) (indicated by an open circle at \( x = 1 \)).
- The steps rise at discrete points corresponding to specific x-values (e.g., steps at \( x = 2, 3, 4, \) etc.), with the height of each step reflecting the cumulative probability.
- **Convergence:**
- The graph visually indicates that as \( x \) increases, \( F_X(x) \to 1 \). This behavior is typical for CDFs, reflecting the sum of probabilities converging to 1 as \( x \) approaches infinity.
- **Notation:**
- Annotations on the graph describe the convergence: \( F_X(x) \to 1 \) as \( x \to \infty \).
This step function is an essential concept in probability theory, demonstrating how cumulative probabilities accumulate in discrete scenarios, and it serves as a foundational tool for analyzing random variables.
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