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24 Aug 2021, 09:28
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B
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Difficulty:
25%
(medium)
Question Stats:
79% (01:18) correct
21%
(01:26)
wrong
based on 77
sessions
History
Date
Time
Result
Not Attempted Yet
The distribution of a certain test is a normal distribution. If two standard deviations more than the mean is 88 and one standard deviation less than the mean is 76, what is the value of the mean?
A. 78
B. 80
C. 82
D. 84
E. 86
A. 78
B. 80
C. 82
D. 84
E. 86
DashingNightmare2
Current Student
Joined: 30 May 2021
Last visit: 19 Jun 2022
Posts: 101
Own Kudos:
Given Kudos: 77
Location: India
Concentration: Marketing, Technology
Schools: ISB '23 (A)
GMAT 1: 750 Q50 V41
GPA: 2.96
28 Aug 2021, 11:09
Kudos
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Mean + 2*S.D =88
Mean - S.D = 76 => 2*Mean - 2*S.D =152
Adding above 2 equations => 3 *Mean = 240 => mean =80
hence B
Mean - S.D = 76 => 2*Mean - 2*S.D =152
Adding above 2 equations => 3 *Mean = 240 => mean =80
hence B
29 Mar 2023, 12:22
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