Question 1105140
using z=(x-mean)/sd
for 12, z=(12-12.2)/0.3, so want z <-2/3
probability is 0.2525
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between 11.8 and 12
need 11.8, which is a z of -4/3
want z between -4/3 and -2/3
probability is 0.1613
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More than 12.6 ounces is a z > +4/3, which is 0.0912.  This would not generally be considered unusual unless one decided anything above the 90th percentile was.
z on calculator 2nd VARS 2 and the z values -6, -2/3 (I use -6 but anything less is fine).  This could be done from the table as well.