What are the expected value (mean) and standard deviation for the number of “pro” voters? What is the probability that the number of voters who support the candidate is exactly 50? What is the probability that the number of “pro” voters is more than 70? What is the probability that the number of “pro” voters is between 50 and 65?
Compound Probability
Compound probability can be defined as the probability of the two events which are independent. It can be defined as the multiplication of the probability of two events that are not dependent.
Tree diagram
Probability theory is a branch of mathematics that deals with the subject of probability. Although there are many different concepts of probability, probability theory expresses the definition mathematically through a series of axioms. Usually, these axioms express probability in terms of a probability space, which assigns a measure with values ranging from 0 to 1 to a set of outcomes known as the sample space. An event is a subset of these outcomes that is described.
Conditional Probability
By definition, the term probability is expressed as a part of mathematics where the chance of an event that may either occur or not is evaluated and expressed in numerical terms. The range of the value within which probability can be expressed is between 0 and 1. The higher the chance of an event occurring, the closer is its value to be 1. If the probability of an event is 1, it means that the event will happen under all considered circumstances. Similarly, if the probability is exactly 0, then no matter the situation, the event will never occur.
A candidate for a local council member is thought to have the support of 60% of the voters. A random sample of 100 voters was gathered to verify this position. Use the normal approximation of a binomial to answer the following questions.
- What are the
expected value (mean) and standard deviation for the number of “pro” voters? - What is the probability that the number of voters who support the candidate is exactly 50?
- What is the probability that the number of “pro” voters is more than 70?
What is the probability that the number of “pro” voters is between 50 and 65?
Step by step
Solved in 3 steps with 2 images
