Answer:
So then the minimum sample to ensure the condition given is n= 38
Step-by-step explanation:
Notation
represent the sample mean for the sample
population mean (variable of interest)
represent the population standard deviation
n represent the sample size
ME = 4 the margin of error desired
Solution to the problem
When we create a confidence interval for the mean the margin of error is given by this formula:
(a)
And on this case we have that ME =4 and we are interested in order to find the value of n, if we solve n from equation (a) we got:
(b)
The critical value for 96% of confidence interval now can be founded using the normal distribution. The significance is 
. And in excel we can use this formula to find it:"=-NORM.INV(0.02;0;1)", and we got 
, replacing into formula (b) we got:
So then the minimum sample to ensure the condition given is n= 38
Answer:
If I’m seeing it right I think it is 160units^3
The answer is c to the problem
The number of x-ray machines that were sold last year by Khybar inc. is C. 157.
<h3>How to calculate the value?</h3>
From the information given, the the company can sell an x-ray machine which cost $508.17 and the commission was $79,558.59.
Therefore, the number of x-ray machines that were sold last year by Khybar inc. will be:
= 79558.59/508.17
= 156.5 = 157
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