Sorry for the bad handwriting.
17/2, 8 and 1/2 or 8.5 are all the correct answers.
Given that half of the personal music players sold by a particular brand have a flaw. If the player has the flaw, it dies in the first six months. If it does not have this flaw, then only 20% fail in the first six months.
Let A be the event that it fails in I 6 months
B1 = it has a flaw
B2 = it does not have a flaw
B1 and B2 are mutually exclusive and exhaustive
the chances that it has this flaw
=The probability that it has the flaw is
3/8x=6.
x=6*8/3.
x=2*8.
x=16.
Nicole started with 16 feet of string.