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.
One light year is the distance that light travels in one year. The speed of light is 186,000 miles per second, or 300,000 km per second. There are 60 seconds in a minute, and 60 minutes in an hour. There are 24 hours in a day and a year is 365.25 days long. So, multiply 186,000 times 60 times 60 times 24 times 365.25.