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03 Jan 2024, 02:30
Kudos
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B
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Difficulty:
25%
(medium)
Question Stats:
80% (01:18) correct
20%
(02:05)
wrong
based on 76
sessions
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The running times of students in a 100-meter race are represented by 6 data values: a, 6a, a, 4a, 3a, and 3a. Was the average (arithmetic mean) of these 6 data values greater than 9?
(1) a < 6
(2) a > 3
(1) a < 6
(2) a > 3
The running times of students who ran 100 meters included 6 data values 𝑎, 6𝑎, 𝑎, 4𝑎,3𝑎, and 3𝑎. Was the average (arithmetic mean) of the 6 data values greater than 9?
(1) a < 6
(2) a > 3
(1) a < 6
(2) a > 3
03 Jan 2024, 09:46
Kudos
Bookmarks
Sum of timings = 18a which would give average to be 3a
St-1: a<6, a can be 5 or 1 then 3a may or may not be greater than 9
St-2: a>3, we know for sure that 3a would be greater than 9
Hence B
St-1: a<6, a can be 5 or 1 then 3a may or may not be greater than 9
St-2: a>3, we know for sure that 3a would be greater than 9
Hence B
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