A helicopter hovers at an altitude that is 1000 feet above a mountain peak of altitude 5210 feet, as shown in the figure. A second, taller peak is viewed from both the mountaintop and the helicopter. From the helicopter, the angle of depression is 43, and from the mountaintop, the angle of elevation is 18.

Chapters 17 – 20 Notes Thinking About Chance • Chance behavior is unpredictable in the short run but has a regular and predictable pattern in the long run. • This is the basis for the idea of probability. Randomness and Probability • A phenomenon is random if individual outcomes are uncertain but there is a regular distribution of outcomes in a large number of repetitions. • The probability of any outcome of a random phenomenon is a number between 0 and 1 that describes the proportion of times the outcome would occur in a very long se