Can anyone help? Please show working. Thank you!
1.Let X be a random variable with a normal distribution with mean 4 and standard deviation 2 and let Z be a random variable with the standard normal distribution.
a) Find Pr(X>4)
2006-11-01 17:58:05 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Yes that is the real question.
2006-11-01
18:05:47 ·
update #1
Part b then asks you to find Pr9X>5) = Pr(Z
Is that really the question? Prob of a normal variable being greater than the mean? It's just 0.5. What's the real question, and what has Z to do with it?
2006-11-01 18:01:51 · answer #1 · answered by Hy 7 · 0⤊ 0⤋
Agree with Hy. P(x>4)=0.5, as long as the distribution is normal and not skewed. If the next question is P(x>z), now that's more interesting.
2006-11-02 02:08:39 · answer #2 · answered by Philo 7 · 0⤊ 0⤋