1. ## Normal Curve Probability...

"A population is normally distributed with a mean of 25.8 and a standard deviation of 1.5. What is the probability that a randomly selected member of the population will have a measure greater than 28?"

And yet there are NO examples of this in the book nor in the online course.

Help?

2. Originally Posted by MathIsRelativelyUseless
"A population is normally distributed with a mean of 25.8 and a standard deviation of 1.5. What is the probability that a randomly selected member of the population will have a measure greater than 28?"

And yet there are NO examples of this in the book nor in the online course.

Help?
Compute the z-score of 28 : $z=\frac{28-25.8}{1.5}=1.467$

Now look this up in a table of the cumulative standard normal to find: $P(z\le 1.467)$, and you want $P(z > 1.467)=1-P(z \le 1.467)$

RonL

3. Ah, thank you sir.