Statistical Analysis Lesson 4
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Online Exam 4_04
Question 1 of 20
5.0 Points
The diameters of pencils produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. In a random sample of 460 pencils, approximately how many would you expect to have a diameter less than 0.293 inches?
A. 123
B. 118
C. 112
D. 111
Question 2 of 20
5.0 Points
The weights of the fish in a certain lake are normally distributed with a mean of 20 lb and a standard deviation of 6. If 9 fish are randomly selected, what is the likelihood that the mean weight will be between 17.6 and 21.6 lb?
A. 0.9370
B. 0.6800
C. 0.6730
D. 0.0968
Question 3 of 20
5.0 Points
The annual precipitation for one city is normally distributed with a mean of 72 inches and a standard deviation of 3.5 inches. Fill in the blanks.
In 99.7% of the years, the precipitation in this city is between __________ and __________ inches.
Apply the 68-95-99.7 rule to this questions.
A. 61.5, 82. 5
B. 82.5, 61.5
C. 61.5, 85.5
D. 63.5, 82.5
Question 4 of 20
5.0 Points
Decide which of the described variables likely have a normal or near-normal distribution.
a) The amount of change held by a teacher at the end of each day for a year
b) The amount of pocket money held by each student at a mid-sized liberal arts college at a given time
c) The number of heads that show when two coins are tossed
A. a
B. b
C. c
D. None
Question 5 of 20
5.0 Points
A study of the amount of time it takes a mechanic to rebuild the
transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4
hours and the standard deviation is 1.77 hours. Assume that a random
sample of 40 mechanics is selected and the mean rebuild time of the
sample is computed. Assuming the mean times are normally...