MATH 1A Midterm: MATH 1A Harvard Spring1998p2
MATH 191
PRACTICE EXAM
APRIL 13, 2001
Note: this practice exam is somewhat longer than the actual hourly.
If you’re planning on trying it with a time constraint, allow an hour
and a half.
1
Document Summary
Note: this practice exam is somewhat longer than the actual hourly. If you"re planning on trying it with a time constraint, allow an hour and a half. 1: a single 6-sided die is rolled repeatedly until the third time a 6 comes up. Two red and eight black balls are placed in an urn, and you get to pick a subset of 4 of the 10 balls at random. , n. if the die comes up k, we then ip k coins. Let x be the random variable given by the number of heads that come up in the coin ips. Calculate the expectation and variance of x: a very rudimentary slot machine costs to play, and pays o . with probability . 45 (and pays nothing 55% of the time). A fancier machine also costs to play, but has a ashier payo structure: it pays o with probability . 1, with probability.
