Statistics
Test 1
Prof. VanderHoff
Spring 2006
All work must be shown on exam to receive credit.
1. [5] A fan offered a bet of $25 against his $5 that RUN would win the conference title.
What does this tell us about
the subjective probability that the fan assigns to RUN winning?
2. [5] The mean time to complete a test is 67 minutes.
The standard deviation for time is 12.
Assume the time is
normally distributed.
What is the probability that the test is completed in more than
93 minutes?
3. [5] Download time has a mean of 35 seconds and a standard deviation
equal to 14 seconds.
The price of cds has a
mean of $10 and a standard deviation of $2.
Is download time or cd price
more variable?
4. [40] Calculate the statistics below using the following data from a sample:
12
7
3
6
7
2
4
Mean:
Median
Mode
Range
Variance
Standard deviation
Z score for X= 25
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5. [5] The probability that appraiser A is not available is .25; the probability that appraiser B is not available is .3.
The
probability
that
both are unavailable is .1.
What is the probability that either or both are unavailable?
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 Spring '10
 VANDERHOFF
 Statistics, Normal Distribution, Probability, Standard Deviation

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