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

x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x