Answer:
16,30.34
Step-by-step explanation:
No because that would just be measuring freshman a better sampling method would be surveying the same number of students for each grade
Answer:

Step-by-step explanation:
Already, we are given 12% of our sample size as 24.
To find the sample size, we equate to find 100%.
Let sample size be denoted by 

Hence, the sample has 200 families.
Answer:
The fourth option is the correct answer
Step-by-step explanation:
The given expression is
-2n(5+n-8-3n)
Given that n=3,We substitute the value of n into the expression and simplify.
This implies that,
-2n(5+n-8-3n)=-2(3)[5+3-8-3(3)]
=-6(5+3-8-9)
=-6(-9)
=54
Hence the answer is 54