For the sample:

Applying this to the whole population:

Since we can't have "0.52 of a person" we roudn to the neares whole, or 496.
Answer:
21.21
Step-by-step explanation:
length of arc= 135°÷360×2×π×r
take π=22/7
radius=18/2=9
135°÷360×2×22/7×9
using calculator= 21.21
2.085 x 10^6
= 2.085 x 100,000 = 2,085,000
The correct answer is C.
12.83 but the three repeats .