Constructing a probability distribution using a frequency distribution

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In order to build the frequency distribution, we must first find the total number of observations. In order to do this, we sum all the frequencies from the table you gave:

Number of Observations = 13+15+38+37+22+14+16+45 = 200

Then, the probability of each outcome (each possible number of overtime hours) is calculated as:
(Frequency for that outcome)/(Number of Observations)

For example, there were 13 employees with 0 hours of overtime. So we conclude that the probability of an employee ...