Addition Rule of Probability
It simply refers to the likelihood of an event taking place whenever the occurrence of an event is uncertain. The probability of a single event can be calculated by dividing the number of successful trials of that event by the total number of trials.
Expected Value
When a large number of trials are performed for any random variable ‘X’, the predicted result is most likely the mean of all the outcomes for the random variable and it is known as expected value also known as expectation. The expected value, also known as the expectation, is denoted by: E(X).
Probability Distributions
Understanding probability is necessary to know the probability distributions. In statistics, probability is how the uncertainty of an event is measured. This event can be anything. The most common examples include tossing a coin, rolling a die, or choosing a card. Each of these events has multiple possibilities. Every such possibility is measured with the help of probability. To be more precise, the probability is used for calculating the occurrence of events that may or may not happen. Probability does not give sure results. Unless the probability of any event is 1, the different outcomes may or may not happen in real life, regardless of how less or how more their probability is.
Basic Probability
The simple definition of probability it is a chance of the occurrence of an event. It is defined in numerical form and the probability value is between 0 to 1. The probability value 0 indicates that there is no chance of that event occurring and the probability value 1 indicates that the event will occur. Sum of the probability value must be 1. The probability value is never a negative number. If it happens, then recheck the calculation.
Question 11
![**Title: Determining the Measure of Arc \( \overarc{CD} \)**
**Objective:**
Learn how to determine the measure of an arc in a circle using given angles.
**Problem Statement:**
Determine the measure of \( \overarc{CD} \) from the diagram below.
**Diagram Description:**
The diagram depicts a circle with points A, B, C, D, and E marked on it.
- Points B and C are located on the circumference of the circle while points A and D are outside the circle.
- Line segments \( AB \) and \( CD \) are secants intersecting the circle at points B and C, respectively.
- The two secants intersect each other at point E, which is inside the circle.
- The measure of angle \( \angle ABE \) is given as \( 88^\circ \), and the measure of angle \( \angle DEC \) is given as \( 80^\circ \).
**Explanation of Steps to Solve:**
1. **Identify the given information:**
- Secant \( AB \) intersects the circle at points A and B.
- Secant \( CD \) intersects the circle at points C and D.
- The measure of \( \angle ABE = 88^\circ \).
- The measure of \( \angle DEC = 80^\circ \).
2. **Recall the properties of intersecting secants:**
- When two secants intersect inside a circle, the measure of the angle formed is half the sum of the measures of the intercepted arcs. Specifically,
\[
\angle ABE = \frac{1}{2} (\overarc{BC} + \overarc{AD})
\]
- Also,
\[
\angle DEC = \frac{1}{2} (\overarc{CD} + \overarc{AB})
\]
3. **Solve for the measure of \( \overarc{CD} \):**
- Recognize that \( \angle DEC = 80^\circ \), and it intercepts arcs \( CD \) and \( AB \).
\[
80^\circ = \frac{1}{2} (\overarc{CD} + \overarc{AB})
\]
Therefore,
\[
160^\circ = \overarc{CD} + \overarc{](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ffeb8ca9d-9969-400c-8a44-95370ebd76d8%2Feb94b370-ae7a-43d1-858c-e0d42d15114a%2Fki073cl_processed.png&w=3840&q=75)
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