"If the mean IQ is 100 with SD = 15, what is the approximate probability that a randomly chosen sample of 9 people will have a mean IQ greater than 110?"

Respuesta :

Answer:

[tex]8.71[/tex] %

Explanation:

We will find solution to this question by using normal distribution method.

We are required to find

[tex]P(X\geq 110)[/tex]

We will find the z-score

[tex]z = \frac{x-\alpha }{\beta*\sqrt{n} }[/tex]

Where

[tex]\alpha[/tex] is the means and [tex]\beta[/tex] is the standard deviation and n represents the number of sample

Substituting the given values, we get -

[tex]z = \frac{110-100}{15\sqrt{9} } \\z = 0.223[/tex]

Thus, area to the right side of [tex]0.67[/tex] in a normal distribution curve is will represent [tex]P (Z>0.223)[/tex]

[tex]P(X\geq 110)[/tex] [tex]=[/tex][tex]P (Z>0.223)[/tex]

[tex]= 0.0871[/tex]