Question

A box contains 4 red bulbs, 3 green bulbs and 5 white bulbs, a bulb is selected at the random from the box

A. What is the probability of selecting red bulb
B. What is the probability of selecting green bulb

Answer 1

A. Probability of selecting a red bulb = Number of red bulbs / Total number of bulbs
Probability of selecting a red bulb = 4 / (4 + 3 + 5) = 4 / 12 = 1/3

B. Probability of selecting a green bulb = Number of green bulbs / Total number of bulbs
Probability of selecting a green bulb = 3 / (4 + 3 + 5) = 3 / 12 = 1/4