Following are the weights in kg of 8 students of a class 48.5, 50, 44.5, 49.5, 50.5, 45 , 51, 43 . find the mean weight, what will be the weight if a student of 55 kg is also included?

Let r be a robotic arm with a fixed base and seven links. the last joint of r is a prismatic joint, the other ones are revolute joints. give a set of parameters that determines a placement of r. what is the dimension of the configuration space resulting from your choice of parameters?