The actual area of the field is 35.
The left sum would be f0+f1+f2+f3
The right sum would be f1+f2+f3+f4
The trapezoidal rule value is:
(f0+f1)/2 + (f1+f2)/2+(f2+f3)/2 +(f3+f4)/2
This would put the trapezoidal rule in the middle , which makes the answer:
Lower sum < Trapezoidal rule Value < Upper sum
Answer:
im not sure if the 3 is an exponent. But if it is, your answer is 0.52180067
Probability of choosing a black fly = 30/100 = 0.3
Probability of choosing a grey fly = 70/100 = 0.7
So, probability of choosing 2 grey flies = 0.7*0.7 = 0.49