Question

In a box containing 100 balls 10 are defective the probability that out of asample of 5 balls non is defective is......

Answer 1

Answer:

Step-by-step explanation:

Total balls =100 : defective =10

Total nondefective balls =100-10=90.

5 balls is taken from nondefective balls.

The probability with replacement :5c5/90c5.

The probability without replacement :5c1/90c1 *4c1/89c1 *3c1/88c1 * 2c1/87c1 * 1c1/86c1.