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Assume that adults have I0 scores that are normally distributed with a mean of 100 and a
standard deviation of 15. For a randomly selected adult, find the indicated probability of IQ
score. Round IQ score to the nearest whole number. Draw a graph in each case.
1. Find the probability of an IQ greater than 70.
2. Find the probability that a randomly selected adult has an IQ between 110 and 120.
3. Find the first quartile Q, which is the IQ score separating the bottom 25% from the top 75%.

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Assume that adults have I0 scores that are normally distributed with a.pdf

  • 1. Assume that adults have I0 scores that are normally distributed with a mean of 100 and a standard deviation of 15. For a randomly selected adult, find the indicated probability of IQ score. Round IQ score to the nearest whole number. Draw a graph in each case. 1. Find the probability of an IQ greater than 70. 2. Find the probability that a randomly selected adult has an IQ between 110 and 120. 3. Find the first quartile Q, which is the IQ score separating the bottom 25% from the top 75%.