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The figure above shows a normal distribution with mean ? an
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28 Aug 2020, 10:28
28 Aug 2020, 10:28
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The figure above shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution in each of the six regions shown. Tina’s travel times to school last year were approximately normally distributed, with a mean of 45 minutes and a standard deviation of 3 minutes. According to the figure shown, approximately what percent of Tina’s travel times to work last year were greater than 42 minutes?
A. 84%
B. 68%
C. 48%
D. 34%
E. 28%
Re: The figure above shows a normal distribution with mean ? an
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28 Aug 2020, 10:28
28 Aug 2020, 10:28
Expert Reply
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Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
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Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
For more theory and practice see our GRE - Math Book
Re: The figure above shows a normal distribution with mean ? an
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28 Aug 2020, 11:38
28 Aug 2020, 11:38
1
Look at the graph.
Mean is 45 min.
Sd = 3 min.
So, 42 minutes is Mean - SD - and this number cuts the density into 2 pieces: 1 that lies before and holds 16% and another that lies on the right-hand side - 84%. The correct answer is 84% then
Mean is 45 min.
Sd = 3 min.
So, 42 minutes is Mean - SD - and this number cuts the density into 2 pieces: 1 that lies before and holds 16% and another that lies on the right-hand side - 84%. The correct answer is 84% then
