Because we're creating a 95% confidence interval, this means we have two tails of 2.5%. When we look up 0.025 in the Z table (click to open) , we find that it corresponds to a z-score of 1.96. After plugging everything into the equation, we find a lower bound of 480.8 and an upper bound of 559.2.
As already noted, the speed of light (expressed in meters per second) means that light travels a distance of 9,460,528,000,000 km (or 5,878,499,817,000 miles) in a single year. This distance is known as a âlight yearâ, and is used to measure objects in the Universe that are at a considerable distances from us.
A light-year is defined as the distance that light can travel in 1 year. We can calculate this by multiplying the speed of light by 1 year (or 3.1557*10^7 seconds) to find the distance: d = c*t. =(2.9979*10^8 m/s)*(3.1557*10^7 s) =9.4605*10^15 meters. or ~9,500,000,000,000 kilometers.