In a batch of 500 pens, 50 are found to be defective. A pen is selected at random from batch, find the probability that it is non defective.option is : a.) 10/11 b.) 9/10 c.) 3/10 d.) 4/5

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justaguide | College Teacher | (Level 2) Distinguished Educator

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In a batch of 500 pens, 50 are found to be defective. The number of non-defective pens in the batch is 500 - 50 = 450. The probability of a pen selected at random from batch being non-defective is equal to 450/500 = 9/10.

The correct answer is option b.

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