Suppose we have independent observations X1 and X2 from a distribution with mean and standard deviation . What is the variance of the mean of the two values: X1 + X2
Do they want the equation?

Acylinder with a base diameter of x units has a volume of jxcubic units which statements about the cylinder are true? check all that apply. the radius of the cylinder is 2 x units. the radius of the cylinder is 2x units. the area of the cylinder's base is 200 square units. the area of the cylinder's base is a square units. the height of the cylinder is 2x units. the height of the cylinder is 4x units. mark this and return save and exit next submit

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?

How many 2/5s are in 1 and 1/2 plz someone me right now