Assume that IQ scores are normally distributed with a mean 101.9 pts and a standard deviation of 11.8 pts. Let X be the IQ score of a randomly selected person. 1. Describe the probability distribution of X and state its parameters μ and σ: X - Select an answer (fe Select an answer Z ZETB Т 2. Find the probability that the IQ score of a randomly selected person is a. less than 112.9 pts. b. between 97.2 and 119.2 pts. c. more than 121.6 pts. σ= (Round the answer to 4 decimal places) 3. Find the 75-th percentile for the IQ score. (Round the answer to 4 decimal places) (Round the answer to 4 decimal places) pts (Round the answer to 1 decimal place)

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Question 5
Assume that IQ scores are normally distributed with a mean 101.9 pts and a standard deviation of 11.8 pts.
Let X be the IQ score of a randomly selected person.
1. Describe the probability distribution of X and state its parameters and o:
X
Select an answer
Select an answer
Z
X²
B
2. Find the probability that the IQ score of a randomly selected person is
a. less than 112.9 pts.
b. between 97.2 and 119.2 pts.
c. more than 121.6 pts.
σ=
(Round the answer to 4 decimal places)
3. Find the 75-th percentile for the IQ score.
(Round the answer to 4 decimal places)
(Round the answer to 4 decimal places)
pts (Round the answer to 1 decimal place)
Transcribed Image Text:Question 5 Assume that IQ scores are normally distributed with a mean 101.9 pts and a standard deviation of 11.8 pts. Let X be the IQ score of a randomly selected person. 1. Describe the probability distribution of X and state its parameters and o: X Select an answer Select an answer Z X² B 2. Find the probability that the IQ score of a randomly selected person is a. less than 112.9 pts. b. between 97.2 and 119.2 pts. c. more than 121.6 pts. σ= (Round the answer to 4 decimal places) 3. Find the 75-th percentile for the IQ score. (Round the answer to 4 decimal places) (Round the answer to 4 decimal places) pts (Round the answer to 1 decimal place)
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