Answer
a) y | p(y)
25 | 0.8
100 | 0.15
300 | 0.05
E(y) = ∑ y . p(y)
E(y) = 25 × 0.8 + 100 × 0.15 + 300 × 0.05
E(y) = 50
average class size equal to E(y) = 50
b) y | p(y)
25 | 
100 | 
300 | 
E(y) = ∑ y . p(y)
E(y) = 25 × 0.4 + 100 × 0.3 + 300 × 0.3
E(y) = 130
average class size equal to E(y) = 130
c) Average Student in the class in a school = 50
Average student at the school has student = 130
I believe it would be the first choice
Hope that helps!
Answer:
706.5 inches squared
Step-by-step explanation:
The formula for the area of a circle is pi r^2. r being the radius. Because you have the radius, and pi is 3.14 in this case, your new formula is A=3.14(15)^2. 15 squared is 225, times 3.14 gives you 706.5
Your final answer is already in tenths so you don't need to round! Hope this helps :)) and brainliest is always appreciated
Answer:
The Moon's diameter is greater than
miles
Step-by-step explanation:
we know that



by proportion
Find the Moon's diameter
Let
x-----> the Moon's diameter in inches

Compare

therefore
The Moon's diameter is greater than
miles