I need to calculate the standard uncertainty in grams. Pls help:(

Below are data from a series of trials balancing an object that is hung from one end of a meter stick by moving the pivot point and letting the torque due to the force of gravity on the meter stick hold the system in equilibrium. The location of the pivot point is measured from the center of mass of the meter stick. The meter stick used has a mass of 125 g and is perfectly uniform, with its center at the 50.0 cm mark. 1 meter r m The mass of the object, measured by a digital scale, is 217 g. Over the next few questions, we are going to determine if the average mass of the object, based on the experimental trials, is in agreement with the mass as measured with a digital scale. Remember that "agreement" in this case refers to the measured value being within a range of 12Ax, where Ax is the standard uncertainty, of the calculated mean. r (m) Trial 1 0.319 Trial 2 0.304 Trial 3 0.319 Trial 4 0.313 Trial 5 0.326 D Question 5 10 pts Review Question Calculate the standard uncertainty for the mass of the object. This value should also be in units of grams (g)