How to round 3,068 to the nearest thousand

If 20% of a number is 35, what is 50% of that number?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

Which rule describes the composition of transformations that maps △abc to △a”b”c