Consider a Study of Patients with Heart Problems That Follows

Consider a study of patients with heart problems that follows them for 5 years after treatment and measures the number of myocardial infarctions (i.e., heart attacks) they experience.
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Number of myocardial infarctions in the next five years.

$\begin{array}{l}\text { Number }\\\begin{array}{cc}\text { of events } & \text { Frequency } \\\hline 0 & 45 \\1 & 35 \\2 & 10 \\3 & 5 \\4 & 3 \\5 & 2\end{array}\end{array}$ Using the data shown in the table, calculate the mean, median, variance, standard deviation, coefficient of variation, and interquartile range for the data values. Also, what proportion of patients experienced subsequent myocardial infarctions?