For each confidence level in the table below, determine the right-tail area (a/2) and the corresponding critical z-value (za/2). Report right-tail area as decimal (not percent) accurate to 4 decimal places. Report (positive) critical values accurate to 2 decimal places. Confidence Level Right Tail Area (a/2) Critical Value (za/2) 76.6% 82.3% 90.7%