The DVD disk company makes DVD's to be recorded on at are 120 mm wide. The size of the manufactured disks have a standard deviation of 1 mm. The
company manufactures 1000 DVD's an hour.

A)What % of the DVD's would you expect to be greater than 120 mm wide?

B)In one hour how many DVD's would you expect to be between 119 mm
and 121 mm?
DVD's are rejected if they are more than 122 mm wide or less than 118 mm wide? How many DVD's would you expect to be rejected one hour?

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.