Answer:
For this one, I think it's: A. pyramid
Answer:
Margin of error = 0.475
Step-by-step explanation:
Given that,
Confidence level, C = 0.95
Sample size, n = 100
Population standard deviation, 
When the confidence level is 0.95, the value of 
The margin of error is given by :

So, the margin of error is 0.475.