Sunday

December 21, 2014

December 21, 2014

Posted by **Courtney** on Saturday, November 10, 2007 at 4:02pm.

8. Two companies market new batteries targeted at owners of personal music players. DuraTunes claimes a mean battery life of 11 hours, while RockReady advertises 12 hours.

-Suppose the standard deviations are 2hours for DuraTunes and 1.5 hours for RockReady. You are headed for 8 hours at the beach. Which battery is most likely to last all day? Explain.

10. John Beale of Stanford< CA, recorded the speeds of cars driving past his house, where the speed limit read 20 mph. The mean of 100 readings was 23.84 mph, with a standard deviation of 3.56 mph. (He actually recorded every car for a 2-month period. These are 100 representative readings.)

- How many standard deviations from the mean would a car going under the speed limit be?

**Answer this Question**

**Related Questions**

Statistics - There are 6 batteries. Two are defective. If you pull out two ...

Statistics - A battery manufacturer is positive that its AA batteries last for 1...

English rep of an algebraic problem - Hello, I need HEEEELP. I need to create ...

statistics - Suppose that 8% of a certain batch of calculators have a defective ...

statistics - Do you think there is a correlation between CEO salaries and the ...

physics (elastic collision) - A ball of mass .44 kg and speed of 4.5 m/s ...

Financial Data and Choosing stocks - Now that you’ve analyzed a company based on...

Math - I need help on two problems. How would you go about solving: 1. 3(a-5) + ...

statistics - In a box of thirty AAA batteries, there are three defective ...

Writting - I need to write a 5-graph paragraph about either 1. A time I was ...