Answer: 90% confidence interval would be
Step-by-step explanation:
Since we have given that
n₁ = 50
Number of metal tagged penguins survived = 10
So, 
n₂ = 50
Number of electronic tagged penguins = 18
So, 
So, at 90% confidence interval, z = 1.28
So, interval would be
Hence, 90% confidence interval would be
So to find this you multiply each dimension by 2/3, so it would be 18cm by 12cm, so the answer is C. Hope this helps!
First you compare two things and for example there are three boys and two girls the ratio would be 3 to 2