The number of gallons of paint that Home Depot sells in a given day is normally distributed with a mean of 181 gallons and a standard deviation of 43 gallons (I realize that the distribution is probably different for weekends compared to weekdays, but just assume everyday has the distribution). How many gallons of paint have to be sold in a given day in order for that day to be in the top 5% of the highest number of gallons sold? (please round your answer to 2 decimal places)

If you could explain a little that would be great. thanks.