and S.D. of 15A. IQ more than 140B. IQ between 120 and 140C. IQ between 90 and 109D. IQ less than 55E. 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)?

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

Secure Information

Content will be erased after question is completed.

Enter the email address associated with your account, and we will email you a link to reset your password.

Forgot your password?

Sign Up