Scores on the SAT verbal test in recent years follow approximately the N(515, 109) distribution.

The proportion of students scoring between 460 and 550 is closest to

A. 0.317.
B. 0.309.
C. 0.626.
D. 0.681.

Among the most famous of all meteor showers are the perseids, which occur each year in early august. in some areas the frequency of visible perseids can be as high as 40 per hour. given that such sightings are poisson events, calculate the probability that an observer who has just seen a meteor will have to wait at least five minutes before seeing another.