STATISTICS Math 221 WEEK 4 Homework Questions with Answers: DeVry University
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Course
Math 221
Institution
Math 221
Question 1
0 / 2 pts
The length of time a person takes to decide which shoes to purchase is normally distributed with a mean of 8.54 minutes and a standard deviation of 1.91. Find the probability that a randomly selected individual will take less than 6 minutes to select a shoe purchase. Is this ...
Question 1
pts
The length of time a person takes to decide which shoes to purchase is normally
distributed with a mean of 8.54 minutes and a standard deviation of 1.91. Find the
probability that a randomly selected individual will take less than 6 minutes to select a
shoe purchase. Is this outcome unusual?
Homework Help:
4VA. Calculating normal probabilities (Links to an external site.) (2:18)
4DA. Description of normal distribution, area, and probabilities, definition of unusual
events (Links to an external site.)(DOCX)
Probability is 0.91, which is unusual as it is greater than 5%
You Answered
Probability is 0.09, which is unusual as it is less than 5%
Correct Answer
Probability is 0.09, which is usual as it is not less than 5%
Probability is 0.91, which is usual as it is greater than 5%
Question 2
pts
Monthly water bills for a city have a mean of $108.43 and a standard deviation of
$36.98. Find the probability that a randomly selected bill will have an amount greater
than $165, which the city believes might indicate that someone is wasting water. Would
a bill that size be considered unusual?
Homework Help:
4VA. Calculating normal probabilities (Links to an external site.) (2:18)
4DA. Description of normal distribution, area, and probabilities, definition of unusual
events (Links to an external site.)(DOCX)
Probability is 0.94, which is usual as it is greater than 5%
, Correct Answer
Probability is 0.06, which is usual as it is not less than 5%
You Answered
Probability is 0.06, which is unusual as it is not less than 5%
Probability is 0.94, which is unusual as it is greater than 5%
Question 3
pts
In a health club, research shows that on average, patrons spend an average of 42.5
minutes on the treadmill, with a standard deviation of 4.8 minutes. It is assumed that
this is a normally distributed variable. Find the probability that randomly selected
individual would spent between 35 and 48 minutes on the treadmill.
Homework Help:
4VA. Calculating normal probabilities (Links to an external site.) (2:18)
4DA. Description of normal distribution, area, and probabilities, definition of unusual
events (Links to an external site.)(DOCX)
0.62
Correct!
0.81
-0.19
0.19
Question 4
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