1)    A factory produces light bulbs, and each bulb has a 5% chance of being defective. A quality
control inspector selects 20 bulbs at random from the production line.

Let X be the number of defective bulbs in the sample.

Question:
What is the probability that exactly 2 of the selected bulbs are defective?







2)    A call center receives an average of 6 calls per hour.

Let X be the number of calls received in a randomly chosen hour.

Questions:

1.     What is the probability that the call center receives exactly 4 calls in one hour?

2.     What is the probability that the call center receives at most 5 calls in one hour?

3.     What is the probability that the call center receives at least 3 calls in one hour?