Suppose the random variable $x$ is best described by a normal distribution with $\mu = 22$ and $\sigma = 6.6$. Find the $z$-score that corresponds to each of the following $x$ values.

(a) $x = 15$
$z =$

(b) $x = 34$
$z =$

(c) $x = 39$
$z =$

(d) $x = 26$
$z =$

(e) $x = 16$
$z =$

(f) $x = 32$
$z =$