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A batch of one hundred bulbs is inspected by testing four randomly chosen bulbs. The batch is rejected if even one of the bulbs is defective. A batch typically has five defective bulbs. The probability that the current batch is accepted is__________.

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In a batch there are total $100$ bulbs of which
$95$ are working
$5$ are defective.

$P$(Selecting $4$ working bulbs)$ = \dfrac{95}{100}\times \dfrac{94}{99}\times \dfrac{93}{98}\times \dfrac{92}{97}= 0.81$
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