Ronald rolled a standard dice 80 times.
He recorded if an odd or even number was rolled, each time, and wrote the results in the table below.
\begin{array} {|l|c|}
\hline
\rule{0pt}{2.5ex} \text{} \rule[-1ex]{0pt}{0pt} & \textbf{Number of times} \\
\hline
\rule{0pt}{2.5ex} \textbf{Odd} \rule[-1ex]{0pt}{0pt} & \text{33} \\
\hline
\rule{0pt}{2.5ex} \textbf{Even} \rule[-1ex]{0pt}{0pt} & \text{47} \\
\hline
\end{array}
What is the difference between the expected number of odd rolls and the actual number recorded? (2 marks)
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