Question

21. A box contains 28 bulbs of which 7 bulbs are defective, a bulb is drawn
randomly from the box. Find the probability of picking a non-defective
bulb.​

Answer 1

Answer:

21/28 is the required probability

Answer 2

The probability of picking a non-defective  bulb is 0.75.

Step-by-step explanation:

Given:

Total number of bulbs in the box = 28

Number of Defective  bulb = 7

To Find:

The probability of picking a non-defective  bulb = ?

Solution:

The probability of pic the bulb that is non defective is

=(Number of non defective bulbs) / (number of bulbs)

The number of bulbs that is non defective  =  Total number of bulb - defective bulb

The number of bulbs that is non defective =  28 -7 = 21

Thus the probability  = $\frac{21}{28}$= 0.75

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