The heights of the adults in one town have a mean of 66.9 inches and a standard deviation of 3.5 inches. what can you conclude from chebyshev's theorem about the percentage of adults in the town whose heights are between 56.4 and 77.4 inches?

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.

Need this asap if anyone can i would be very grateful. if you could show workings that would really

What is the distance between a and b? round your answer to the nearest tenth. a coordinate plane is shown. point a is located at negative 1, 5, and point b is located at 4, 1. a line segment connects the two points.