Multiple lengths in DAC datasheet
The second is nominal, not mean. But yes, height is 0.95 mm minimum, 1.00 mm nominal, and 1.05 mm maximum.

The difference between mean and nominal is that nominal is the target dimension, that's the aim. Mean usually means arithmetic mean, but that may deviate from nominal, depending on spread.  



This could be a statistic on the package thickness. Apparently the injection mold wasn't made precise enough, so that the mean thickness is 1.01 mm (purple line). But the nominal thickness is still 1.00, with 0.95 mm and 1.05 mm as limits. So even with a mean deviating from nominal that condition is met.