Find the probability. 1. In a group of 25 students at lunch, 10 prefer ketchup on their hamburger, 10 prefer mustard on their hamburger, and 5 like both ketchup and mustard on their hamburger. The rest of the students in the group prefer neither. What is the probability that a student selected from this group will prefer ketchup or mustard on their hamburger? Answers 3 0. 25 2 L. 13 2. A card is randomly selected from a standard deck of 52 cards. What is the probability that it is a 2 or an 8? G. 3. In a class of 50 high school juniors, 32 students either play a sport or are in the marching band. There are 22 juniors who play a sport and 16 who are in the marching band. What is the probability that a randomly selected junior plays a sport and is in the marching band? S. 6. 4. You roll a die. What is the probability that you roll an even number or a 5? 5. You roll a die. What is the probability that you roll an odd number or a factor of 6? 4. 1
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.
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