Psychology and Human Behavior
Sensory memory in humans is very short-term and lasts approximately 200-500 milliseconds after an individual perceives an object. Suppose the length of time (in milliseconds) an object remains in sensory memory for a randomly selected adult has an exponential distribution with λ = 0.003. A flashing grid of letters is displayed to a randomly selected adult and the sensory memory is measured.
a. What is the probability that the sensory memory will last for at most 200 milliseconds?
b. Find the median time the sensory memory will last.
c. Find a time t such that only 5% of all adults' sensory memory lasts at least t milliseconds.