CUNYFirst # Last Name:
First Name:
2. The life of a certain type of engine is normally distributed with a mean of 10 years, and a
standard deviation of 1.5 years.
(1) If one engine is randomly selected, what is the probability that the life of this engine
is between 8 and 13 years?
What are the parameters?

List the 10 possible samples (without replacement) of size 3 3 that can be obtained from the population of five officials.

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.

Scenario: a rectangular plot of ground is 5 meters longer than it is wide. its area is 20,000 square meters. question: what equation will you find the dimensions? note: let w represent the width. options: w(w+5)=20,000 w^2=20,000+5 (w(w+5))/2=20,000 w+2(w+5)=20,000