Certain tubes produced by a company have a lifetime of 900 hours and a standard deviation of 80 hours. The company send out 1000 lots of 200 tubes each in how many lots can we expect the mean life time to exceed 910 hours.

Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

Its unlawful in the state of florida for any person to operate a motor vehicle unless each passenger of the vehicle under age of

What are the two main purposes of edgar allen poe’s, “the masque of the red death? ”