Fifty boxes each of 50 bolts were inspected for the number which were defective. The following was the result
$\begin{array}{c|c} \text{No. defective per box} & 4 & 5 & 6 & 7 & 8 & 9 \\ \hline \text{No. of boxes} & 2 & 7 & 17 & 10 & 8 & 6\end{array}$
Find the percentage of boxes containing at least 5 defective bolts each

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