Question

A bag contains 200 bulbs of which 40
bulbs are defective. Find the probability of
choosing a bulb which is non-defective?​

Answer 1

Answer:

Total no of bulbs = 200

Number of bulbs which are defective = 40

so, No of non defective bulbs = 200- 40 =160

Probability = No of possible outcomes ÷ Total no of outcomes

160÷200=4/5

therefore probability of non defective bulbs = 4/5

Answer 2

Given,

A bag contains 200 bulbs of which 40 bulbs are defective.

To Find,

The probability of choosing a bulb which is non-defective =?

Solution,

We can solve the question as follows:

It is given to us that a bag contains 200 bulbs of which 40 bulbs are defective.

Total number of bulbs = 200

Number of defective bulbs = 40

Therefore, the number of non-defective bulbs will be equal to defective bulbs subtracted from the total bulbs.

Number of non-defective bulbs = 200 - 40 = 160

Now,

The probability of any event is equal to the number of favorable outcomes divided by the total number of outcomes.

To find the probability of choosing a non-defective bulb,

Number of favorable outcomes = 160

Total number of outcomes = 200

$Probability = \frac{Favorable\: outcomes}{Total\: outcomes}$

                  $= \frac{160}{200}$

                  $= \frac{4}{5}$

Hence, the probability of choosing a non-defective bulb is equal to 4/5.