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April 29, 2024, 10:00:38 am
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andrewloppol

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« on: October 03, 2010, 05:59:47 pm »
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« Last Edit: September 04, 2015, 04:12:43 am by andrewloppol »
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coletrain

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Re: Quick question :)
« Reply #1 on: October 03, 2010, 06:03:50 pm »
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use inverse normal to find the z value when the area is .1
use the z value in the formula
 z=(value-mean)/ standard deviation
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Whatlol

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Re: Quick question :)
« Reply #2 on: October 03, 2010, 06:06:52 pm »
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Quote from: andrewloppol on October 03, 2010, 05:59:47 pm
The weights of the members of a junior swimming squad are normally distributed with a mean of 46kg and a standard deviation of 3.2kg.  Ten percent of these children are not allowed to enter an endurance event because their body weight is too low.
The minimum weight; in kg, of a child permitted to enter the endurance event is closest to...


:D thanks in advance!


Pr( X < a ) = 0.1

Using inverse normal distribution on the calculator, z = -1.2815

using z = (a- mean )/( s.d)

a = 41.899 kg.

so about 42kg.
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