The 2 angles are complemantary or form right angles so 
so
. Plugging that into BDC we get 11
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The expected value of the inseam length of the jeans is found as
30% of 30+ 25% of 32+ 10% of 34+ 10% of 36 + 10% of 38 + 15% of 40
=
=
Hence, the third option 33.8 is the correct expected value.