Thread: standard normal distribution

Hi, I'm having a very hard time trying to solve this, please help me. I need to find the indicated probability using the standard normal distribution. the problem is this P(-196 <z <1.96) Could you help me with the steps on how to solve this. Thank you in advance.

Originally Posted by mkcar

Hi, I'm having a very hard time trying to solve this, please help me. I need to find the indicated probability using the standard normal distribution. the problem is this P(-196 <z <1.96) Could you help me with the steps on how to solve this. Thank you in advance.

You should have a table of the cumulative standard normal distribution.

This should tell you P(z<Z), so look up the table for Z=1.96, then:

P(-1.96<z<1.96) = 1-2[1-P(z<1.96)],

but you should have this particular case memorised, without looking I can
tell you that it is 0.95.

RonL