If Z is a random variable having the standard normal distribution,find
A) P (Z>=-0.79);
B) P (-1.90>=Z>=0.44).
If Z is a random variable having the standard normal distribution,find
A) P (Z>=-0.79);
B) P (-1.90>=Z>=0.44).
Hello,
Here are general rules for the standard normal distribution (and it will look very logical if you look at a z-table : http://www.science.mcmaster.ca/psych...e/z-table2.jpg)
define p(.) as the black area. it's defined for positive values.
If a>0
P(Z>a)=0.5-p(a)
P(Z<a)=1-P(Z>a)=0.5+p(a)
If a<0
P(Z<a)=P(Z>-a)=0.5-p(-a)
P(Z>a)=P(Z<-a)=0.5+p(-a)
P(a<Z<b)=P(Z<b)-P(Z<a)
and that's all ^^