The ball corporation's beverage can manufacturing plant in fort atkinson, wisconsin, uses a metal supplier that provides metal with a known thickness standard deviation σ = .000507 mm. assume a random sample of 53 sheets of metal resulted in an x⎯⎯ = . mm. calculate the 90 percent confidence interval for the true mean metal thickness. (round your answers to 4 decimal places.) the 90% confidence interval is from to

 (0.3332, 0.33341)

Step-by-step explanation:

Formula to find the confidence interval for population mean :

, where n= Sample size

= sample mean.

= Critical z-value (two-tailed)

= population standard deviation.

As per given , we have

n= 53

The critical values for 90% confidence interval :

Now , the 90 percent confidence interval for the true mean metal thickness:

Hence, the 90 percent confidence interval for the true mean metal thickness. : (0.3332, 0.3334)

answer: the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

step-by-step explanation:

the given rate of interest i= 85%

in calculating the monthly payment for a loan with an interest rate compounded monthly, the value of the interest rate per period we use in the formula must be in decimal form.

to convert it in decimal, we divide it by 100, we get

hence, the value should be used for i in the formula of calculation the monthly payment , the interest rate per period is 0.85.

the answer is d. 75%