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It is assumed that individual IQ scores (denoted as X) are normally distributed with mean (µ)...

It is assumed that individual IQ scores (denoted as X) are normally distributed with mean (µ) and standard deviation (σ) given as µ = 100 and σ = 15 Use normal table and conversion rule to answer questions below.

1. Find proportion of individuals with IQ score below 109

2. Find a chance that a randomly selected respondent has the IQ score above 103

3. What proportion of individuals would be within the interval (97 ≤ X ≤ 106)

4. What X-value corresponds to z-score equal to 1.28?

Math   Statistics-And-Probability   
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