1. ## A quick question...

Can someone please give me a boost on how to solve these kind of problems? Are they all solved with the same formula or do you know what they are 'called' so I can google the concept? THANK YOU!!!!!!

If P(0<z<a)=0.3212 (a is positive), find a?
a)0.2
b)0.02
c)0.9
d)0.92

If P(-b<z<b)=0.3182 (b is positive), find b?
a)0.41
b)0.42
c)0.39
d)0.44

If P(z>c)=0.2358 (c is positive), find c?
a)0.71
b)0.70
c)0.72
d)0.27

What is the P(z>2.58)?
a)0.5194
b)0.4951
c)0.4915
d)0.0049

What is the P(0.34<z<2.67)?
a)0.4099
b)0.0863
c)0.4915
d)0.4962

2. Originally Posted by aawb9c
Can someone please give me a boost on how to solve these kind of problems? Are they all solved with the same formula or do you know what they are 'called' so I can google the concept? THANK YOU!!!!!!

What is the P(z>2.58)?
a)0.5194
b)0.4951
c)0.4915
d)0.0049

If P(0<z<a)=0.3212 (a is positive), find a?
a)0.2
b)0.02
c)0.9
d)0.92

You want to search for Z-scores to learn about this one. I'm looking into the other ones.

Probability of a Random Variable in the Normal Distribution

Press Probability Greater than, and enter 2.58, Press Calculate. It will show you the math.

The general consensus for Z-scores is people grab values from a pre-approved table and go from there.

2nd question I quoted, answer is d, use the same link. this time, use the Probability between button, 2 values come from your question, 0 and 0.92

If P(z>c)=0.2358 (c is positive), find c?
a)0.71
b)0.70
c)0.72
d)0.27