Question
and it is equally likely that it arrives during any of those minutes. Suppose that you arrive at the bus stop five minutes early. What is the probability that the bus is more than 15 minutes late?
15%    85%    15/17    0
Draw a graph from 2 minutes early to 15 minutes late. Divide it in to minutes. Shade in the appropriate region. How many minutes are in the graph? How many minutes did you shade?
Question 5
X~N(5.7, 0.61). Find the z-score corresponding to an observation of 4.7.
1.64   -1.64    1.02    -1.02
If X~N(mu, sigma) then z= (x-mu)/sigma.brnbsp;brRemember to do the subtraction before dividing by sigma.
Question 6
Scores on an exam follow an approximately Normal distribution with a mean of 74.3 and a standard deviation of 7.4 points. What percent of students scored below 80 points?
0.2206   0.7794   0.8078   0.2297   0.7703   0.1922
To find areas to the left of an observation, first find the z-score, and then look up the area in the middle of the Z table.

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