1. There are 3 machines in a factory that perform all production. Let these machines work independently of each other with probabilities 0.8, 0.9 and 0.95, respectively. a. If the random variable is defined as the number of machines running at any one time, find the probability distribution of ?. b. According to the maintenance agreement made by the factory, the repair price of a machine is fixed at 500 TL. To repair the broken machines at any time, every time the maintenance personnel are called, they maintain each of the intact ones for 50 TL. In this case, how much is this maintenance agreement expected to cost to the factory?
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.
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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.
1. There are 3 machines in a factory that perform all production. Let these machines work independently of each other with probabilities 0.8, 0.9 and 0.95, respectively. a. If the random variable is defined as the number of machines running at any one time, find the probability distribution of ?. b. According to the maintenance agreement made by the factory, the repair price of a machine is fixed at 500 TL. To repair the broken machines at any time, every time the maintenance personnel are called, they maintain each of the intact ones for 50 TL. In this case, how much is this maintenance agreement expected to cost to the factory?
Let X = Number of machines working
Let machines be A1, A2 and A3
Let these machines work independently of each other with probabilities 0.8, 0.9 and 0.95, respectively.
a) Find the probability distribution of x, if the random variable is defined as the number of machines running at any one time:
X = 0 => No machine is working and so on
X = 0 => P(X= 0) = (1-0.8)(1-0.9)(1-0.95)
= 0.2*0.1*0.05
= 0.001
X = 1 => P(X= 1) = 0.8(1-0.9)(1-0.95)+(1-0.8)(0.9)(1-0.95)+(1-0.8)(1-0.9)(0.05)
= 0.014
X = 2 => P(X = 2) = 0.8(0.9)(1-0.95)+(1-0.8)(0.9)(0.95)+(0.8)(1-0.9)(0.95)
= 0.283
X = 3 => P(X = 3) = 0.8*0.9*0.95
= 0.684
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