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12/13/2018 Print Test
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PRINTABLE VERSION
Test 2
You scored 42 out of 48
Question 1
Your answer is CORRECT.
Suppose that 80% of all trucks undergoing a brake inspection at a certain inspection facility pass the
inspection. Consider groups of 17 trucks and let X be the number of trucks in a group that have passed the
inspection. What is the probability that there will be between 10 and 12 trucks (inclusive) pass the
inspection?
a)
0.5120
b)
0.0680
c)
0.2308
d)
0.2041
e)
0.80
Question 2
Your answer is CORRECT.
A service center receives an average of 0.6 customer complaints per hour. Management's goal is to receive
fewer than three complaints each hour. Assume the number of complaints follows the Poisson distribution.
Determine the probability that exactly four complaints will be received during the next eight hours.
Question 3
Your answer is CORRECT.
Given the cumulative distribution:

12/13/2018 Print Test
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Determine Q1, the first quartile.
Question 4
Your answer is CORRECT.
The average life a manufacturer's blender is 5 years, with a standard deviation of 1 year. Assuming that the
lives of these blenders follow approximately a normal distribution, find the probability that the mean life a
random sample of 9 such blenders falls between 4.4 and 5.1 years.