1.) The height of a continuous probability curve over a given point is equal to:
the standard deviation
2.) The mean and median are the same for a normal distribution.
3.) In a statistical study, the random variable X = 1, if the house is colonial, and X = 0 if the house is not colonial, then it can be stated that the random variable is continuous.
4.) The actual weight of hamburger patties is an example of a continuous random variable.
5.) For a continuous distribution, P(X ≤ 100) = P(X < 100).
6.) A standard normal distribution has a mean of ____ and standard deviation of ___.
7.) Which two distributions are useful in analyzing queues?
Binomial and normal
Normal and exponential
Poisson and normal
Poisson and exponential
8.) The area under the normal curve between z = 0 and z = 1 is _________ the area under the normal curve between z = 1 and z = 2.
A, B, or C above depending on the value of the mean
A, B, or C above depending on the value of the standard deviation
9.) If a random variable x has a uniform distribution with a mean of 10 and the lowest value of x is 5, what is the largest value of x that can exist?
10.) The price-to-earning ratio for firms in a given industry is distributed according to a normal distribution. In this industry, a firm with a Z value equal to 1:
has an above average price-to-earning ratio.
has a below average price-to-earnings ratio.
has an average price-to-earnings ratio.
may have an above average or below average price-to-earnings ratio.
11.) A student’s grade on an examination was transformed to a z value which is negative. Therefore, we know that he scored:
higher than 16% of the class.
higher than 45% of the class.
above the first quartile.
below the mean.
above the mean but below the median.
12.) The MPG (mileage per gallon) for a mid-size car is normally distributed with a mean of 32 and a standard deviation of .8. What is the probability that the MPG for a selected mid-size car would be less than 33.2?
13.) The number of standard deviations that a value x if from the mean is:
14.) A uniform distribution has the following shape:
15.) A methodology that attempts to determine the number of servers that strikes an optimal balance between the time customers wait for service and the cost of providing service is: