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IQ scores have a population mean mu = 100 and a population standard deviation sigma = 15 . Convert the following standard z interval val, z <= 2.58 , to an x interval .
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IQ scores have a population mean mu = 100 and a population standard deviation sigma = 15 . Convert the following standard z interval val, z <= 2.58 , to an x interval .

User Petr Rastegaev
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1 Answer

7 votes

we get that


Z=(x-\mu)/(\sigma)\rightarrow x=\sigma\cdot Z+\mu=15\cdot2.58+100=138.7

so the interval is


X\le138.7

User Methkal Khalawi
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