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.
So.. 1 kilometer = 0.621371192 miles so since 186,282.397 mi. = 299.337 km per second, multiply 299.337 by 360 to get how many kilometers per hour light travels which is 107761.32 km per hour. Then, since there are 8,765.813 hours in a year, light travels a total of 944615579.75316 km per year. 50,000km/h X 8765.813 = 438290650 km per year So you're looking at roughly two years.