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#1
09-10-2013
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 592 Threads: 92 Thanked 198 Times in 129 Posts Reputation: 208
Normal Distribution Question

On a gross anatomy quiz, test scores of 10, 10, 10, 70, 40, 20, and 90 are obtained by seven students in a laboratory group.
Which of the following correctly describes these quiz scores?

(A) Positively skewed
(B) A normal distribution
(C) Negatively skewed
(D) The mode is higher than the mean
(E) The mode is equal to the mean
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 The above post was thanked by: jayashree (09-11-2013)

#2
09-10-2013
 USMLE Forums Scout Steps History: 1+CK+CS Posts: 41 Threads: 20 Thanked 24 Times in 10 Posts Reputation: 34
A

MEAN 35.7 (36)
MEDIAN 20
MODE 10

Positively skewed MEAN>MEDIAN>MODE
 The above post was thanked by: Insomniac (09-11-2013)
#3
09-11-2013
 USMLE Forums Scout Steps History: --- Posts: 58 Threads: 9 Thanked 6 Times in 6 Posts Reputation: 16

Well first looking at the numbers:
the mean is: 35
median: 20
mode: 10
since mean is great than medium which is greater than mode- it is a positive skew so
A!

#4
09-11-2013
 USMLE Forums Master Steps History: 1+CK+CS+3 Posts: 592 Threads: 92 Thanked 198 Times in 129 Posts Reputation: 208

Correct
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 Tags Biostatistics-Epidemiology, Step-1-Questions

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