During ww2, mortars were fired from trenches dug 4 feet in the ground. the mortars had an average velocity of 150 ft/s. what is the highest altitude the mortar can reach, and how long would it take to strike its target?

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics