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26 Aug 2024, 01:30
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
64% (01:09) correct
36%
(01:20)
wrong
based on 83
sessions
History
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Not Attempted Yet
Is the average age of a class of 60 students more than 30 years?
(1) 59 students in the class are exactly 30 years of age each.
(2) The average age of 5 of the students in the class is less than 30 years.
(1) 59 students in the class are exactly 30 years of age each.
(2) The average age of 5 of the students in the class is less than 30 years.
26 Aug 2024, 03:32
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(1) 59 students in the class are exactly 30 years of age each.
Without knowing the age of the one other student it is impossible to workout whether the average age of the students is greater than 30.
INSUFFICIENT
(2) The average age of 5 of the students in the class is less than 30 years.
Without knowing the ages of the other 55 students one cannot determine whether the classes average age is greater than 30.
INSUFFICIENT
(1+2)
For the average to be greater than 30, the sum of the ages needs to exceed (60*30) 1800.
From statement 1 one knows that 59 of the students are 30 years old. Statement 2 then shows that the age of the one student excluded in statement 1 is younger than 30. If all the ages, bar one, are 30 and the last one is under 30 then the sum will never exceed 1800. Therefore, the average age is below 30.
SUFFICIENT
ANSWER C
Without knowing the age of the one other student it is impossible to workout whether the average age of the students is greater than 30.
INSUFFICIENT
(2) The average age of 5 of the students in the class is less than 30 years.
Without knowing the ages of the other 55 students one cannot determine whether the classes average age is greater than 30.
INSUFFICIENT
(1+2)
For the average to be greater than 30, the sum of the ages needs to exceed (60*30) 1800.
From statement 1 one knows that 59 of the students are 30 years old. Statement 2 then shows that the age of the one student excluded in statement 1 is younger than 30. If all the ages, bar one, are 30 and the last one is under 30 then the sum will never exceed 1800. Therefore, the average age is below 30.
SUFFICIENT
ANSWER C
26 Aug 2024, 07:39
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I think both statement are required to answer the question.
Hence Answer should be D
Both statement together answers the questions
Statement 1 : State average of 59 is 30 but average can down or up based on 60th observation. Hence 60th observation decides the result
Statement 2: Hints about 60th observation (as all other observation are same)
Hence 1 & 2 answers the ques
Hence Answer should be D
Both statement together answers the questions
Statement 1 : State average of 59 is 30 but average can down or up based on 60th observation. Hence 60th observation decides the result
Statement 2: Hints about 60th observation (as all other observation are same)
Hence 1 & 2 answers the ques
