Most IQ scores are normally distributed with μ=105 and σ= 12. 1.What is the score needed to...

Question

Question

Most IQ scores are normally distributed with μ=105 and σ= 12.

1.What is the score needed to place a randomly selected participant in the 40th percentile?

2. what proportion of participants score:
a. between 85 and 115

b. 102 and above

c. below 70

d. below 72 or above 130

3.What is the probability that a random sample of 20 individuals has an IQ score:

a) less than 98?
b) between 100 and 105?
c) above 103?

Answer 1

Answer #1

Answer 2

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