Probability of an event is the measure of its chance of occurrence. The mean of the given probability distribution is 3
<h3>How to calculate the expectation(also called mean) of a discrete random variable?</h3>
Expectation can be taken as a weighted mean, weights being the probability of occurrence of that specific observation.
Thus, if the random variable is X, and its probability mass function is given as: f(x) = P(X = x), then we have:
(n is number of values X takes)
For the given case, we have:
X = project grade (from 1 to 5, thus, 1, 2,3,4, or 5 as its values.)
The probability distribution of X is given as:
Using the aforesaid definition, we get the mean of random variable X as:
Thus, the mean of the given probability distribution is 3
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