If you are looking to find the margin of error using 95% confidence, here is the formula:
Margin of error = 1.96(sd/√n)
Verifying Requrements and finding the margin of error
Credit rating FICO credit rating scores of a smiple random sample of applicants for credit cards 95% confidence =50,x=677 and is knownd to be 68
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log(ab)=loga+logb
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