The Wechsler IQ test has a mean of 100 and a standard deviation of 15. Assume th

Question

The Wechsler IQ test has a mean of 100 and a standard deviation of 15. Assume that IQ scores are normally distributed. Compute the following. Be sure to label your answers with the correct matematical notation and provide a one sentence explanation of your answer.

**PLEASE NOTE** - I am using Excel and it is CRUCIAL that I know the excel functions to discover the answers. PLEASE HELP ME UNDERSTAND THIS BY LISTING THEM!!! Finding the answer isn't as hard for me as being able to input the functions via excel. THANK YOU SO MUCH!!!!

Find the probability that a randomly selected adult has an IQ less than 115 Notation Answer Find the probability that a randomly selected adult has an IQ greater than 131.5 (the requirement for membership in Mensa) Notation Answer Find the probability that a randomly selected adult has an IQ between 90 and 110. (the normal range) Notation Answer Find P20, which is the lQ score separating the bottom 20% from the top 80%. Notation Answer Find the lascore separting the top 15% from the others. Notation Answer

Explanation / Answer

P(X<115) =norm.dist(115,100,15,true)=0.8413

b)P(X>131.5) =1-norm.dist(131.5,100,15,true)

c)P(90<X<110) =norm.dist(110,100,15,true)-norm.dist(90,100,15,true)

d)=norm.inv(0.2,100,15)

e)=norm.inv(0.85,100,15)

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