Exercise 4 One machine can produce three different types of screws S1, S2, S3. One and the same variety is always produced per work shift. The shares in production are 30% for S1, 45% for S2 and 25% for S3. Unfortunately, the machine does not work without any problems. The probability of a fault-free layer is 91% for type S1, 95% for S2 and 85% for S3. a) What is the probability that a shift will not have a disruption? b) A fault occurred during a shift. What is the probability that S3 grade was produced during this shift? c) What would have to be (instead of 85%) the probability of an interference-free shift in the production of type S3 in order to increase the probability of an interference-free shift from sub-task a) to 92.5%?
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.
Exercise 4
One machine can produce three different types of screws S1, S2, S3. One and the same variety is always produced per work shift. The shares in production are 30% for S1, 45% for S2 and 25% for S3. Unfortunately, the machine does not work without any problems. The
b) A fault occurred during a shift. What is the probability that S3 grade was produced during this shift?
c) What would have to be (instead of 85%) the probability of an interference-free shift in the production of type S3 in order to increase the probability of an interference-free shift from sub-task a) to 92.5%?
d) What is the probability that a shift will be free of faults if grade S2 is not produced during this shift?
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