3.
For a normal distribution with a mean of 40, the probability to the left of 30 is 0.21.
(You do not need to know the standard deviation to answer these.)

What is the probability between 30 and 40?
0.5 - 0.21 = 0.29
-
What is the probability to the right of 50

Question

3.
For a normal distribution with a mean of 40, the probability to the left of 30 is 0.21.
(You do not need to know the standard deviation to answer these.)

 What is the probability between 30 and 40?
0.5 - 0.21 = 0.29
-
What is the probability to the right of 50

anonymous · Answer

I can help u

anonymous · Answer

Well I know the answer is right there. But I don't understand how to do it without std dv?