A survey is planned to determine the mean annual family medical expenses of employees of a large company. The management of the company wishes to be 90%
confident that the sample mean is correct to within
±$60
of the population mean annual family medical expenses. A previous study indicates that the standard deviation is approximately
$281.
a. How large a sample is necessary?
b. If management wants to be correct to within
±$15,
how many employees need to be selected?

Phyllis and chen are saving money to go to a football game. each friend starts with some money and saves a specific amount each week. phyllis made a graph to show the total she has saved at the end of each week. chen wrote an equation to show the total, y, he has saved at the end of each week, x. y = 15x + 15 compare the amount that each friend has when both friends start saving. select the correct answer from the drop-down menu to complete the statement. phyllis starts with $ and chen starts with $

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

How is the number of vertices for a prism related to the name of the prism