30% of the library books in the fiction section are worn and need replacement. 10% of the nonfiction holdings are worn. The libr
ary’s holdings are 80% fiction and 20% non fiction. find the probability that a book chosen at random from this library is worn and needs replacement. Please help!
1 answer:
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Answer:
C
Step-by-step explanation:
do that with pithagoras:
20² + 4,5² = x²
400 + 20,25 = x²
420,25 = x²
x =
x ~ 20,5
Letter C: 20,5 feet