Question

When microprocessors are made, it is known that in any batch, 15% are defective.
a) What is the probability of picking a microprocessor that is NOT defective
b) A batch of 5000 microprocessors are produced. How many would be expected to have NO defects.

Answer 1

Answer:

a) Probability of picking a microprocessor that is not defective is 75% (100-15).

b) In 5000 microprocessor 75%(100-15) will have no defect so the number of microprocessors will be,

 =>75% of 5000

 i.e    

 =>((75 x 5000)/100)

 =>3750 microprocessors

Answer 2

Answer:

a) 15 x / 20

b) 3750

Explanation :

a) Let total microprocessors be x.

Defective = 15 % of x

Non defective = ( 100 - 15 ) % of x  = 75% of x = 15 x / 20

b) Total  microprocessors = 5000

Non defective = 15 x / 20 = (15 * 5000) / 20 = 3750

Hope , it helps : )