Answer:
8.8 cm
Step-by-step explanation:
-We know that the top 20% of the books are oversized.
-We therefore find the z-value of the top 20%:
#We substitute the z value in formula to solve X.
Where
- X is the minimum thickness of the book.
-Given 
, the minimum thickness,X can be calculated as follows:
Hence, the minimum thickness of the oversized books is 8.8 cm
15% is .15
<span>.15 x 18 = 2.70 </span>
<span>18 - 2.70 = 15.30</span>
So what they need to rais is what the school doesn't give them
so to find that subtract what the school gives them from how much they need
need=680
given=130
680-130=550
they need to raise 550
if each member raises the same amount we fid that by doing
total divided by number of members
total=550
number o fmembers=50
550/50=11
each must raise $11
