The batch gets accepted if the randomly selected four items are all from the 95 non-defective items. Thinking in terms of a sequential model avails us of using the multiplication rule. The probability we are interested in is,

\[P(\text{accept}) = \frac{95}{100} \cdot \frac{94}{99} \cdot \frac{93}{98} \cdot \frac{92}{97} \approx 0.814\]