Jamie purchased a dvd that was on sale for 15% off. the sales tax in her county is 5%. let y represent the original price of the dvd. write an expression that can be used to determine the final cost of the dvd.

Now, martin can reasonably guess that the standard deviation for the entire population of people at the mall during the time of the survey is $1.50. what is the 95% confidence interval about the sample mean? interpret what this means in the context of the situation where 95 people were surveyed and the sample mean is $8. use the information in this resource to construct the confidence interval.