test two
Before flipping a fair coin, Sunil assesses that he has a 50% chance of obtaining tails.
Classical probability
Which of the following does not represent a continuous random variable?
The number of customer arrivals to a bank between 10 am and 11 am.
Which of the following can be represented by a discrete random variable?
The number of obtained spots when rolling a six-sided die
What does it mean when we say that the tails of the normal curve are asymptotic to the x axis?
The tails get closer and closer to the x axis but never touch it.
The probability that a normal random variable is less than its mean is
0.5
Which of the following represents a subjective probability?
A skier believes she has a 10% chance of winning a gold medal.
A political reporter announces that there is a 51% chance that the next person to come out of the conference room will be a Republican, since there are 88 Republicans and 86 Democrats in the room.
Empirical probability
Which of the following statements is the most accurate about a binomial random variable?
It counts the number of successes in a given number of trials.
At the beginning of the semester, John believes he has a 90% chance of receiving straight A's.
Subjective probability
We can think of the expected value of a random variable X as
the long-run average of the random variable values generated over infinitely many independent repetitions
Factorial
the number of ways to assign every member of a group of n
Which of the following is not an event when considering the sample space of tossing two coins?
{HH, TT, HTH}
For the sample space S = {apple pie, cherry pie, peach pie, pumpkin pie}, what is the complement of A = {pumpkin pie, cherry pie}?
{apple pie, peach pie}