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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