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.
How many miles per hour does light travel? Light travels at a whopping 186,000 miles per second or about  669,600,000 miles per hour, to answer your question.    This is very fast, but it still takes the light â¦from the sun eight  minutes to reach us, and there is a big difference.    Light from the next nearest star would take at least 4 hours to get  here.