The accompanying data were obtained from the financial aid Receiving Financial Aid Rec Fin Undergraduates 3 4,226 1,873 Graduates Total 6,099 4 Let A be the event that a student selected at random from th (a) Find each of the following probabilities. (Round y P(A) = P(B) = P(A N B) = P(B | A) = P(B | A^) = %3D %3D
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.
Given a data from financial aid office of a university
Receiving financial aid | Not receiving financial aid | Total | |
Undergraduates | 4226 | 3896 | 8122 |
Graduates | 1873 | 739 | 2612 |
Total | 6099 | 4635 | 10734 |
A is the event that a student selected at random from this university is an undergraduate student.
B is the event that a student selected at random is receiving financial aid.
Consider the formula for probability of an event X as:
(a) Total number of students in university is 10734. Hence total number of favorable outcomes will be
A is the event that a student selected at random from this university is an undergraduate student. Since number of undergraduate students is 8122. Hence number of favorable outcomes is
Hence probability of A will be
Now B is an event that a student selected at random is receiving financial aid. Since number of students receiving financial aid is 6099. Hence number of favorable outcomes is
Hence probability of B will be
Now event means student selected at random from university is an undergraduate student and receiving financial aid. Since number of undergraduate students receiving financial aid is 4226. Hence number of favorable outcomes is
Hence the probability of will be
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