normal distribution

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Provide an appropriate response.
 Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15 (as on the Wechsler test). Find P10

, which is the IQ score separating the bottom 10% from the top 90%.   

Jul 3rd, 2015

Thank you for the opportunity to help you with your question!

 
max iq score below 10% is .1  from the tables the invnorm (.1)=-1.282

given thatZ=-1.82 and z = (value-mean)/standard deviation
  HEnce the value = Standdev*z+mean= 15*-1.282+100=80.77 this is the answer

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 3rd, 2015

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