Question

In a bulb factory, on checking 100 bulbs randomly, 80 of the bulbs

were found to be working. What is the probability that a bulb selected

at random will work or P(a bulb works) If there are 500 bulbs in a pack,

predict how many of the bulbs will not work.

Note:

STD 7A 7B 7C

Total 33 30 31

Boys 21 30 00

Girls 12 00 31​

Answer 1

Answer:

Probability = Number of possible outcomes /Number of outcomes

Step-by-step explanation:

Possibility of number of bulbs works = 80/500

=4/25

Possibility of number of bulbs will not work= 20/500=1/25.