A study was done to determine the efficacy of three different drugs—A, B, and C—in relieving headache pain. Over the period covered by the study, 50 subjects were given the chance to use all three drugs. The following results were obtained: 20 reported relief from drug A 20 reported relief from drug B 31 reported relief from drug C 8 reported relief from both drugs A and B 13 reported relief from both drugs A and C 14 reported relief from both drugs B and C 43 reported relief from at least one of the drugs. Note that some of the 20 subjects who reported relief from drug A may also have reported relief from drugs B or C. A similar occurrence may be true for the other data. (a) How many people got relief from none of the drugs? (b) How many people got relief from all three drugs?
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.
- 20 reported relief from drug A
- 20 reported relief from drug B
- 31 reported relief from drug C
- 8 reported relief from both drugs A and B
- 13 reported relief from both drugs A and C
- 14 reported relief from both drugs B and C
- 43 reported relief from at least one of the drugs.
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