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 a unit of length equal to the distance that light travels through vacuum in a year (about 5,787,499,810,000 miles). It is often confused as a unit of time. The official definition of a light year uses the Julian year of 365.25 days and the speed of light 2.99792458 times 10 to the â¦.