C.
Although this is not the exact answer the circumference formula is 2(pi)r. Which is far more than the other two options.
Measures of angles 2, 3, 4, added equal 180
Step-by-step explanation:
x=20
y=100
solution in image
Answer: 0.4758
Step-by-step explanation:
Given : Mean : 
Standard deviation : 
Also, the new population of pilots has normally distributed .
The formula to calculate the z-score :-

For x=130 lb .

For x=171lb.

The p-value =

Hence, the required probability : 0.4758