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16 Sep 2014, 01:16
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What is the average (arithmetic mean) age of all students in the city's schools?
(1) The average (arithmetic mean) age of students in each school in the city is 12 years.
(2) Each school in the city has 70 students.
(1) The average (arithmetic mean) age of students in each school in the city is 12 years.
(2) Each school in the city has 70 students.
16 Sep 2014, 01:16
Kudos
Bookmarks
Official Solution:
What is the average (arithmetic mean) age of all students in the city's schools?
(1) The average (arithmetic mean) age of students in each school in the city is 12 years.
Given that the average age is the same across all schools, the overall average age will also be equal to the average age in each school. Sufficient.
(2) Each school in the city has 70 students.
This statement is clearly insufficient, as it provides no information about the students' ages.
Answer: A
What is the average (arithmetic mean) age of all students in the city's schools?
(1) The average (arithmetic mean) age of students in each school in the city is 12 years.
Given that the average age is the same across all schools, the overall average age will also be equal to the average age in each school. Sufficient.
(2) Each school in the city has 70 students.
This statement is clearly insufficient, as it provides no information about the students' ages.
Answer: A
01 Feb 2018, 16:50
Kudos
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Hi --
How come we wouldn't need to know how many students were in each of the city's schools and get a weighted average? Is it because the average is the same across all the schools?
Thanks!
How come we wouldn't need to know how many students were in each of the city's schools and get a weighted average? Is it because the average is the same across all the schools?
Thanks!
