QNORM

qnorm
The normal inverse distribution function

         q = qnorm(p,m,s)
         
	Input	 p	probability
		 m	mean (default value is 0)
		 s 	standard deviation (default value is 1)
		(q,m,s can be scalar or matrix with common size)
	Output   q  	real such that Prob(X<q)=p where X is a 
			normal variable with mean m 
			and standard deviation s