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# Range & Standard deviation relation ship in normal distribution

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Intern
Joined: 11 May 2016
Posts: 1
Range & Standard deviation relation ship in normal distribution  [#permalink]

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14 Jul 2017, 13:16
I came across a rule that standard deviation is calculated as range divided by 6 in a normal distribution.
Is this a correct relationship?
Math Expert
Joined: 02 Sep 2009
Posts: 54368
Re: Range & Standard deviation relation ship in normal distribution  [#permalink]

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15 Jul 2017, 02:59
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Menna90 wrote:
I came across a rule that standard deviation is calculated as range divided by 6 in a normal distribution.
Is this a correct relationship?

This will give an approximation in some cases. But you don't need this at all because normal distribution is not tested on the GMAT.
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Re: Range & Standard deviation relation ship in normal distribution   [#permalink] 15 Jul 2017, 02:59
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