deletions | additions       diff --git a/mas ch.6.tex b/mas ch.6.tex  index 2b4231e..327f412 100644  --- a/mas ch.6.tex  +++ b/mas ch.6.tex 
...
$z_{279}=$. Probability=0.8413.$z_{261}=-1$. Probability=0.1587. So probability being betwen 261 days and 279 is $0.8413-0.1587=.6826=68\%$\\  \subsection{6.32}  a)$z=\frac{39-38}{2}=0.5$,with probability=0.6915.To get 39 inches or more take the compliment,1-0.6915=0.3085=$31\%$\\  b)$z=0.Probability b)$z=0$.Probability  of 0.500(makes sense its half way of the distribution).So probability of being taller than 38 inches is $0.5=50\%$\\