contestada

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 .

Respuesta :

we get that

[tex]Z=\frac{x-\mu}{\sigma}\rightarrow x=\sigma\cdot Z+\mu=15\cdot2.58+100=138.7[/tex]

so the interval is

[tex]X\le138.7[/tex]