The following table gives the lifetime in days of 100 electricity tubes of a certain make: \begi...

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The following table gives the lifetime in days of 100 electricity tubes of a certain make:
\begin{tabular}{|l|c|}
\hline Lifetime in days & Number of tubes \\
\hline less than 50 & 8 \\
less than 100 & 23 \\
less than 150 & 55 \\
less than 200 & 81 \\
less than 250 & 93 \\
less than 300 & 100 \\
\hline
\end{tabular}
Find the mean lifetime of electricity tubes.
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