Go to either EXCEL or OPENOFFICECALC. I use the latter. Click on f_sub_x near the top. Locate function NORMSINV. Click next. Enter 0.68/2 = 0.34 in the blank space after number f_sub_x. Hit OK to get -0.4125.
Recall that this process is the inverse of finding the z_score for a given X value, distributed normally with mean mu and SD sigma. The formula is z_score = (X - mu) / sigma
The limits of YOUR values around the mean 201.2 are Lower limit = 201.2 - (6.7)(0.4125) = 198.44 and Upper limit = 201.2 + (6.7)(0.4125) = 203.96. The three values NOT contained in these limits are 208.0, 194.7 and 198.2