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No of Trees with dia greater than 49.4cm from Mean,Avg & SD?

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yasir9909
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No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   Updated on: 24 Aug 2016, 19:34
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Refer to the following data:

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    Tree | Number of Trees | Average (Arithmetic Mean) Diameter | Standard Deviation of Diameter |

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    Oak | 64 | 58 | 11.2 |

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    Maple | 50 | 42 | 7.4 |

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    Hickory | 12 | 17 | 9.6 |

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    Ash | 8 | 39 | 14.5 |

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    Birch | 7 | 25 | 12.0 |
----------------------------------------------------------------------------------------------------------------------

How many maple trees had a diameter greater than 49.4cm?

Show: ::
OA=8

_____________________________________________________________________________________________________________________________________________________


Source : 1007 GRE Practice Questions by Princeton Review

Originally posted by yasir9909 on 23 Aug 2016, 08:54.
Last edited by yasir9909 on 24 Aug 2016, 19:34, edited 3 times in total.
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Sonalika42
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   24 Aug 2016, 01:08
42

QA plzz
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Sonalika42
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   24 Aug 2016, 01:09
Sorry Sorry my mistake....is the answer 8 ?
QA plzz
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yasir9909
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   24 Aug 2016, 03:54
Sorry I forgot to share OA. Your answer is correct.Could you please also share the detailed step by step solution?How to add tags to a post?
Table looks OK in edit mode but gets distorted when posted
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   24 Aug 2016, 13:14
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yasir9909 wrote:
Sorry I forgot to share OA. Your answer is correct.Could you please also share the detailed step by step solution?How to add tags to a post?
Table looks OK in edit mode but gets distorted when posted


Image

You have to remember this curve.

Given that mean of Maple trees is 42 and standard deviation is 7.4.

Now we want tree larger than 49.4 is all trees greater than one standard deviation. From figure we see that it accounts for \(13.6%+2.1%+0.1%\).

So number of tree more than one standard deviation is = \((13.6%+2.1%+0.1%)*50\) trees = 7.9 or approx 8.


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yasir9909
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   24 Aug 2016, 19:45
Great,so other info is given just to confuse.As far as tags are concerned Tag option does not appear in user interface of user,please have a look on these screenshots


Image
Image


I have many other questions to share that I am now feeling reluctant to share because of this TAG issue
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yasir9909
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   24 Aug 2016, 21:36
One more subtle point to discuss here is that there is no mention of Normal Distribution in this question statement.Though your answer is correct,but what makes you assumes that the question is based on Normal Distribution?
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yasir9909
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   25 Aug 2016, 05:45
Here is what appears on my user interface of the page that you have pointed to:

Image

No TAGS option even on this page in my user interface
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   25 Aug 2016, 05:57
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In this post we are mixing apple with orange. A question about SD with the tags option.

What is happening to you Dear Yasir is really odd. A registered user has the tag option both under a new post and after when it is created.

I will see why. But there is nothing to be disappointed :)
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MostofaWahid
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink] New post   29 Sep 2019, 12:57
Read The Question Attentively!! It Must Help. Question asks for Maple Tree only.
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Re: No of Trees with dia greater than 49.4cm from Mean,Avg & SD? [#permalink]
29 Sep 2019, 12:57
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