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17 Jul 2019, 00:50
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Difficulty:
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Question Stats:
87% (01:01) correct
13%
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List M consists of the numbers 10, 20, 30, 40, 50.
Which of the following lists of numbers have an average (arithmetic mean) that is equal to the average of the numbers in list M?
I. 10, 20, 30, 35, 50
II. 10, 22, 30, 38, 50
III. 0, 0, 0, 0, 150
A. I only
B. II only
C. III only
D. II and III only
E. I, II, and III
Which of the following lists of numbers have an average (arithmetic mean) that is equal to the average of the numbers in list M?
I. 10, 20, 30, 35, 50
II. 10, 22, 30, 38, 50
III. 0, 0, 0, 0, 150
A. I only
B. II only
C. III only
D. II and III only
E. I, II, and III
17 Jul 2019, 01:04
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Average = 150/5 = 30
Only option. 2 and 3 match
Posted from my mobile device
Only option. 2 and 3 match
Posted from my mobile device
firas92
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17 Jul 2019, 01:25
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List M = 10, 20, 30, 40, 50 - List M is an ordered set with odd number of consecutive multiples of 10. So mean = median = 30
I. 10, 20, 30, 35, 50 - Same as list M except for one element which is 5 less than corresponding element in list M - Average will be less than list M
II. 10, 22, 30, 38, 50 - Same as list M except 2 more in second element and 2 less in fourth element - Sum will remain unchanged and so average is same as list M
III. 0, 0, 0, 0, 150 - Average is 150/5 = 30 - Same as list M
Only II and III
Answer is (D)
I. 10, 20, 30, 35, 50 - Same as list M except for one element which is 5 less than corresponding element in list M - Average will be less than list M
II. 10, 22, 30, 38, 50 - Same as list M except 2 more in second element and 2 less in fourth element - Sum will remain unchanged and so average is same as list M
III. 0, 0, 0, 0, 150 - Average is 150/5 = 30 - Same as list M
Only II and III
Answer is (D)
