Answer:
A triangle
Step-by-step explanation: The two squares lean against each other
Answer: 288/18+7x5
Step-by-step explanation:
I think the most likely representative sample had more girls than boys that were surveyed for it.
Answer + Step-by-step explanation:
(a)
Check the attached image.
(b)
Range of sample means : 7.5 - 5.75 = 1.25
(c)
The closer the range of the sample means is to 0 ,
the more confident they can be in their estimate . 
The farther the range of the sample means is from 0 ,
the more confident they can be in their estimate .
The mean of the sample means will tend to be a better estimate
than a single sample mean . 
A single sample mean will tend to be a better estimate
than the mean of the sample means .
You are correct
12.2^2 x 3.14 x 6.1 = 2850.9