Tommy used benchmark fractions to estimate the sum of 1
5
+
3
7
as 1. Tommy's teacher said he was incorrect. Explain what error Tommy might have made and what tips you can give him to solve the problem correctly.

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Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

How do you convert 1.27 to a percentage

On saturday a souvenir shop had 125 customers.sixty four percent of the costumers paid with a credit card. how many costumers paid with cash?