问题

Determine $z_{\alpha}$ for the following:

• (a) $\alpha=.0055$
• (b) $\alpha=.09$
• (c) $\alpha=.663$
   

Here $z_{\alpha}$ denote the value on the measurement axis for which $\alpha$ of the area under the $z$ curve lies to the right of $z_{\alpha}$.