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The weights of python snakes are normally distributed with a

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The weights of python snakes are normally distributed with a [#permalink] New post 13 Oct 2020, 06:30
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65% (00:51) correct 34% (01:09) wrong based on 23 sessions
The weights of python snakes are normally distributed with a mean of 110 kg and a standard deviation of 8 kg. If 68% of pythons weigh within one standard deviation of the mean and 95% of pythons weigh within two standard deviations of the mean, what percent of pythons weigh from 94 to 102 kg?

A. 47.5%

B. 34%

C. 27%

D. 17%

E. 13.5%


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[Reveal] Spoiler: OA

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Re: The weights of python snakes are normally distributed with a [#permalink] New post 14 Oct 2020, 17:57
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Quote:
The weights of python snakes are normally distributed with a mean of 110 kg and a standard deviation of 8 kg. If 68% of pythons weigh within one standard deviation of the mean and 95% of pythons weigh within two standard deviations of the mean, what percent of pythons weigh from 94 to 102 kg?

Step 1: Understanding the question
Plotting normal distribution curve with a mean of 110 and standard deviation of 8, refer to the attachment
When 95% of the readings lies between 94 to 126 and 68% lie between 102 and 118, remaining region ie blue = 95% - 68% = 27%
Hence, percent between 94 to 102 = 27/2 = 13.5%

E is correct
Attachments

Untitled.png
Untitled.png [ 8.53 KiB | Viewed 212 times ]


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Re: The weights of python snakes are normally distributed with a   [#permalink] 14 Oct 2020, 17:57
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