Statistics help! please!?

Question

Assume that the readings on the thermomenters are normally distributed with a mean of 0 degrees and a stardard deviation of 1 degrees. A thermometer is randomly selected and tested. find the probablity of this reading in degrees.

less than -0.25

where do i start?! ugh,im so bad at this...

Answer 1

Gah - I hate statistics too. I think - turn -0.25 into a z number and then use the z table. so I guess (-0.25-0)/1 = -0.25

look up the area that z=0.25 gives you in the table - then since its negative go 0.5 minus that area (hope that's clear).

I got 0.401 (or 40.1%)