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.
Green 5/15
red 2/15
that should be your answer
83 FT Because if you divide 786 by 12 (Which is how many inches are in a foot) you will get 65.5 ft.