At a particular factory, refrigerators inspectors on an assembly line notice that a randomly selected refrigerator will have too much enamel with probability 0.2, too little enamel with probability 0.25, uneven application with probability 0.33, and no defects with probability 0.43. Note that it is not possible for the same refrigerator to have both too much and too little enamel. Draw the Venn diagram (but do not complete it) before answering the following questions: (a) What is the probability that a randomly selected refrigerator has a paint defect (i.e. either too much enamel, too little enamel, or uneven application)? (b) What is the probability of a paint defect from an improper amount of paint (i.e. too much or too little enamel)? (c) What is the probability of a paint defect resulting from uneven application but not from an improper amount of paint?
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.
At a particular factory, refrigerators inspectors on an assembly line notice that a randomly selected
refrigerator will have too much enamel with
application with probability 0.33, and no defects with probability 0.43. Note that it is not possible for the
same refrigerator to have both too much and too little enamel. Draw the Venn diagram (but do not
complete it) before answering the following questions:
(a) What is the probability that a randomly selected refrigerator has a paint defect (i.e. either too much
enamel, too little enamel, or uneven application)?
(b) What is the probability of a paint defect from an improper amount of paint (i.e. too much or too little
enamel)?
(c) What is the probability of a paint defect resulting from uneven application but not from an improper
amount of paint?
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