Answer:
125.66
Step-by-step explanation:
11cm squared times pi =380.13
9cm squared times pi =254.47
380.13-254.47=125.66
Since the variance of a Poisson distribution with rate parameter

is

, we know that

. So,
Answer: 565 general admission and 430 lower-level seating tickets sold (Answer (D))
Steps:
Let x be the number of general admission tickets, and y be the number of lower level tickets.
Set up the two equations:
68762.5 = x * 47.50 + y * 97.50 (total price as a sum of individual volumes)
x + y = 995 (sum of individual count = total count of tickets sold)
solve for x, y:
x = 995 - y
plug into the first equation:
68762.5 = (995-y) * 47.50 + y * 97.50
solve for y:
y = 430
then x = 565
x = 565 and y = 430
Explanation:
First you had to square from both sides of equation form.

Then you expanded form.



Solve by equation form.

Add by four from both sides of equation form.

Simplify.

Verified solutions.

Final answer: 
Hope this helps!
And thank you for posting your question at here on brainly, and have a great day.
-Charlie