1.If the time it takes to finish a quiz follows a uniform distribution between 0 and 4 minutes, what is the probability that a quiz chosen at random took 3 or more minutes?
2.If you are told that the time to finish a quiz follows a uniform distribution between 0 and 4 minutes. What is the variance of the distribution?
3. Suppose you are told that the test scores in the class follow a normal distribution with mean 75 and standard deviation 7. What is the probability that if a test is chosen at random, that the score is greater than 85?
4.Suppose that you are told that test scores follow a normal distribution with mean of 75 and standard deviation of 7. What is the probability that a test score chosen at random is greater than 68?
5.If you are told that a variable follows a normal distribution, which of the following is not a characteristic of the distribution?
Possible Options:
a.It's mean and standard deviation determine location and spread
b. It is left-skewed
c. It is bell-shaped
d. It is symmetric
e. None of the above.