IQ scores are standardized to produce a normal dustribution with mean=100...

Mathematics
Tutor: None Selected Time limit: 1 Day

and S.D. of 15
A. IQ more than 140
B. IQ between 120 and 140
C. IQ between 90 and 109
D. IQ less than 55
E.  What is the probability that a person selected at random has an IQ that is more than 3 standard deviations from the mean (Above or below)?

Nov 16th, 2014

z = (140-100)/15 =40/15 = 8/3 =2.67

P(z>2.67) = 0.0038

z=(120-100)/15 = 20/15 = 4/3 =1.33

P(1.33<z<2.67) = 0.0880

z=(90-100)/15 =-10/15 =-0.67

z =(109-100)/15  =9/15 =0.6

P(-0.67<z<0.6)=0.4743

P(z>3) =1-0.9987 =0.0013

P(z< -3) =0.0013

Nov 16th, 2014

Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.
Click to visit
The Notebank
...
Nov 16th, 2014
...
Nov 16th, 2014
Mar 29th, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer