<span>If you have a TI calculator, then you can type in
invnorm(1 - 0.628)
You are subtracting the probability from 1 because the invnorm function finds the z-score given the probability to the left of the z-score</span>
84.85% = 84.85/100 = 0.8485; this is the value we look for in the middle of the table. Once we find it, we see the number to the left is 1.00; above it we have 0.03. This means that 1.00+0.03 = 1.03 is the z-score for this value.