# Thread: Simple Z score Q - need double check

1. ## Simple Z score Q - need double check

Can someone help me calculate this probability using the table.

P(-1.62 < z < 2.81)

I got the answer as 0.0501 . My prof disagrees and says the answer is .9449. can someone explain this to me and how to go about it?

Thanks

Darren

2. Originally Posted by darren_a1
Can someone help me calculate this probability using the table.

P(-1.62 < z < 2.81)

I got the answer as 0.0501 . My prof disagrees and says the answer is .9449. can someone explain this to me and how to go about it?

Thanks

Darren
Pr(z < 2.81) - Pr(z < -1.62) = Pr(z < 2.81) - Pr(z > 1.62) = Pr(z < 2.81) - (1 - Pr(z < 1.62) = Pr(z < 2.81) + Pr(z < 1.62) - 1 = .......