Question 1122418
With a standard deviation of .1 oz, the question simplifies to 


"what is the area to the right of 1.5 standard deviations from the median?" See how 8.25-8.1=.15? And .15/.1 is 1.5? This is 1.5 STDEV away from median.


We need to use a calculator or Z score table. The Z-score for 1.5 is ..9332, the area up to that point. And 1-.9332 = .0668 or 6.68% chance.  We subtract from 1 as the question asked for the chance of a 'greater' result.   You will get he same answer by using a Z value of -1.5 with no need to subtract from 1, but that seems to confuse students a bit. 


See http://users.stat.ufl.edu/~athienit/Tables/Ztable.pdf for a Z-table