How can you reduce the percentage uncertainty in measurements that you make?

you can decrease the uncertainty by making the same measurement multiple times and taking the average.

Explanation:

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

pretty sure it's false