Statistics
Test 1
Prof. VanderHoff
SPRING 2007
All work must be shown on exam to receive credit.
1. [5] The probability that A occurs is .4.
The probability that B occurs is .6.
The probability that A and B
occur is .3.
Are A and B independent?
2. [5] The average time it takes to travel from here to there is 30 minutes.
The standard deviation is 5
minutes.
About 68% of trips take within what range of times?
3. [8] Calculate the grade point average using the following data:
grade
credits
4
40
3
30
2
10
1
0
0
10
4. [30] Calculate the statistics below using the following data from a sample:
1
7
3
2
6
2
1
5
6
1
Mean:
Median
Mode
Range
Variance
Standard deviation
Coefficient of variation
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View Full Document5. [7] The grab bag contains 5 snickers, 10 baby ruths and 15 mars bars.
What the probability of blindly
picking two and both are baby ruths?
6. [5] What is the z score for x=20, when the mean of x=15 and the standard deviation of x = 5?
7. [8] The probability that elevator 1 works is .9; the probability elevator 2 works is .95.
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 Spring '10
 VANDERHOFF
 Statistics, Probability, Standard Deviation, car emissions, gas grill usage

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