If $X$ is a random variable representing test scores, then the 41st percentile is the score $x$ such that $P(X\le x)=0.41$ . Transform $X$ to the random variable $Z$ that follows the standard normal distribution via $X=31.5+7.3Z$ :

$P(X\le x)=P\left(\dfrac{X-31.5}{7.3}\le\dfrac{x-31.5}{7.3}\right)=P\left(Z\le\dfrac{x-31.5}{7.3}\right)=0.41$

The $z$ -score for the 41st percentile is about -0.2275, so

$\dfrac{x-31.5}{7.3}\approx-0.2275\implies\boxed{x\approx29.8}$

6 0

4 years ago

Using the diagram below, find CB in decimal form.

Savatey [412]

Answer:

look at the picture i have sent

5 0

3 years ago

Find the value of x *

monitta

Answer:

98 degrees

Step-by-step explanation:

57 + 41 is 98

so take 98 from 180 which is 82

then you take 82 from 180 to find x which is 98

4 0

3 years ago