SOLUTION: The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway. Speed Miles per Hour Frequency 50 - 54 2 55 -

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Question 869872: The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway.
Speed
Miles per Hour Frequency
50 - 54 2
55 - 59 4
60 - 64 5
65 - 69 10
70 - 74 9
75 - 79 5
35
31. Refer to Exhibit 3-4. The mean is
a. 35
b. 670
c. 10
d. 67
e. None of the above answers is correct.
ANSWER:
32. Refer to Exhibit 3-4. The variance is
a. 6.969
b. 7.071
c. 48.570
d. 50.000
e. None of the above answers is correct.
ANSWER:
33. Refer to Exhibit 3-4. The standard deviation is
a. 6.969
b. 7.071
c. 48.570
d. 50.000
e. None of the above answers is correct.
ANSWER:

Found 2 solutions by ewatrrr, Fombitz:
Answer by ewatrrr(24785)   (Show Source): You can put this solution on YOUR website!


Hi

x	n		x -67	n(x-67)^2	

52	2	104	-15	450	

57	4	228	-10	400	

62	5	310	-5	125	

67	10	670	0	0	

72	9	648	5	225	

77	5	385	10	500	

	35	2345	-15	1700	

	mean	67		50	Variance (n-1) Used

				7.071067812	SD

If Assignment calls for 35 rather than 34 to be used to determine Variance, answers would be:

Variance = 48.57143  and 6.969

 

Answer by Fombitz(32388)   (Show Source): You can put this solution on YOUR website!
 









 

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