The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 1200 hours and a standard deviation of 100 hours. Using the empirical rule,
what percentage of light bulbs last between 1100 hours and 1300 hours?

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score

An engineer scale model shows a building that is 3 inches tall. if the scale is 1 inch = 600 feet, how tall is the actual building?

If a suspect is in possession of 20 grams of cocaine how many ounces does he possess what will the charge be