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 distance. It is the distance that light can travel in a yearâs time which is six trillion miles. Light moves at a velocity of roughly 300,000 kilometers in every second.So in one year, it can travel roughly about 10 trillion km. One light-year is equivalent to 9,500,000,000,000 kilometers.ell, it is quite convenient to measure the distances in space using light year. To take just one example, the distance to the next nearest big galaxy, the Andromeda Galaxy, from earth is 21,000,000,000,000,000,000 km.