If humans originated in africa and migrated to other parts of the world, some time would be required for this to occur. at the modest rate of one kilometer per year, how many centuries would it take for humans originating in africa to travel to china, some 10,000 kilometers away?

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

What could explain what happened when the time was equal to 120 minutes

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