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23 Jul 2025, 22:00
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
59% (00:56) correct
41%
(00:47)
wrong
based on 133
sessions
History
Date
Time
Result
Not Attempted Yet
Kara attends a university where students study for an average (arithmetic mean) of 13.4 hours per week. How many hours per week does Kara study?
(1) The standard deviation of study time at Kara’s school is 2.8.
(2) Kara’s study time is one standard deviation away from the mean.
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
(1) The standard deviation of study time at Kara’s school is 2.8.
(2) Kara’s study time is one standard deviation away from the mean.
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
23 Jul 2025, 22:24
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(1) The standard deviation of study time at Kara’s school is 2.8.
Insufficient,
There can be numerous possibilities of different data points to arrive at standard deviation of 2.8 and given mean of 13.4
(2) Kara’s study time is one standard deviation away from the mean.
Insufficient,
We don't know the standard deviation.
Combining (1) and (2),
We know both standard deviation and mean. Kiara's study time = (mean) +/- 1*(standard deviation) = 13.4 +/- 2.8
Hence, (C) is the answer.
Insufficient,
There can be numerous possibilities of different data points to arrive at standard deviation of 2.8 and given mean of 13.4
(2) Kara’s study time is one standard deviation away from the mean.
Insufficient,
We don't know the standard deviation.
Combining (1) and (2),
We know both standard deviation and mean. Kiara's study time = (mean) +/- 1*(standard deviation) = 13.4 +/- 2.8
Hence, (C) is the answer.
24 Jul 2025, 00:52
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As per your solution, we are getting two values for kara's study time.
Hence answer should be Option E right?
Hence answer should be Option E right?
agrasan
