2020 Jan

Question 3

Suppose an unbiased six-sided die is rolled until each face (number) is observed

at least once. On the average, calculate how many rolls of the die are required?

Identify the name of the probability model in the analysis.

(b) Suppose on every working day of the week (i.e. a weekday from Monday to

Friday), a supplier A sends a batch of components to a particular inspection

station. Similarly, two days a week, a batch also arrives from supplier B.

Given that 80% of all supplier A's batches pass inspection and 90% of supplier

B's batches pass the inspection process. On a randomly selected day, compute

the probability that two batches pass inspection.