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Given that z is the standard normal variable (with mean 0 and standard deviation 1), find a. P(-1.25<z<2.55) b.P(1.03<z<2.33)? ? 2. Given that

Mathematics / Statistics

1. Giventhatzisthestandardnormalvariable(withmean0andstandarddeviation1),find
a. P(-1.25<z<2.55) b.P(1.03<z<2.33)

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2. Given that IQ scores are normally distributed with μ = 100 and σ = 15 , find probability that individual will have an IQ level:

a. between 68 and 120 b. Above 90 c. below110

3. Theserumcholesterollevelsformeninoneagegrouparenormallydistributedwithamean of 178.1 and a standard deviation of 40.4. All units are in mg/100 mL. Find the two levels that separate the top 9% and the bottom 9%.

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