Jemma filled one-fourth of a barrel with compost on Saturday. Then she filled the remaining space with 4{,}200\text{ g}4,200 g4, comma, 200, start text, space, g, end text of compost on Sunday. How many kilograms of compost are in the barrel?

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.