Amachine that produces a major part for an airplane engine is monitored closely. in the past, 10% of the parts produced would be defective. with a .95 probability, the sample size that needs to be taken if the desired margin of error is .04 or less is

216

Step-by-step explanation:

The formula to find the sample size , if prior population proportion is known :-

Given : The prior proportion of defective parts : p= 0.10

Significance level :

Critical value :

Margin of error :

Now, the required sample size will be :-

Hence, the minimum required sample size = 216

i believe the correct answer is b.