A shipment of 20 cameras include 3 that are defective> What is the minimum number of cameras that must be selected if we require that P(at least 1 defective) ≥ 0.8?
The magnitude of earthquakes recorded in a region of North America can be modeled as having an exponential distribution with mean 2.4, as measured on the Richer scale. Find the probability that an earthquake striking this region will
a. Exceed 3.0 on the Richter scale
b. Fall between 2.0 and 3.0 on the Richter scale.