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Fifty boxes each of 50 bolts were inspected for... - JAMB Mathematics 1991 Question

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
A
96
B
94
C
92
D
90
correct option: a

% of boxes containing at least 5 defective bolts each

= (\frac{7 + 17 + 10 + 8 + 6}{50})

= (\frac{48}{50}) x (\frac{100}{1})

= 96%

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