Question 2

The following data gives the information on the observed lifetimes (in hours) of electrical components:

$$\begin{array}{|c|c|}

\hline
\text{Lifetime (in hours)} & \text{Frequency} \\
\hline
0\text{–}20   & 10 \\
20\text{–}40  & 35 \\
40\text{–}60  & 52 \\
60\text{–}80  & 61 \\
80\text{–}100 & 38 \\
100\text{–}120& 29 \\
\hline
\end{array}$$

Determine the modal lifetime of the components.