A product is made up of three parts that act independently of each other. If any of the parts is defective, the product is defective. Part one is defective 5% of the time, part two is defective 10% of the time, and part three is defective 15% of the time. Find the probability of a defective product.

The probability that a product is defective is 0.2733.

Step-by-step explanation:

A product consists of 3 parts. If any one of the part is defective the whole product is considered as defective.

The probability of the 3 parts being defective are:

P (Part 1 is defective) = 0.05

P (part 2 is defective) = 0.10 P (part 3 is defective) = 0.15

Compute the probability that a product is defective as follows:

P (Defective product) = 1 - P (non-defective product)

= 1 - P (None of the 3 parts are defective)

= 1 - P (Part 1 not defective) × P (Part 2 not defective) × P (Part 1 not defective)

Thus, the probability that a product is defective is 0.2733.

Step-by-step explanation:

Let,

No. of girls = x

No. of boys = 120 + x

=> 120 + x + x = 980

=> 120 + 2x = 980

=> 2x = 980 - 120

=> 2x = 860

=> x = 860/2

=> x = 430

=> 120 + x = 120 + 430 = 550

Hence,

No. of girls = 430

No. of boys = 550