What is the force of gravity on the 1.2-kg mass if it were 1.3×107 m above Earth's surface (that is, if it were three Earth radii from Earth's center).

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error