a certain type of concrete mix is designed to a stand 3,000 pounds per square inch of pressure the concrete is poured into casting cylinders and allowed to sit for 28 days concrete strength is then measured the following data represent the strength of non randomly selected cast and PSI compute the mean median and mode strength of the concrete and PSI 3920, 4050, 3230, 3090, 2920, 3800, 4050, 4070, 3740 I need the median strength and mode Strength