9-

You complain to the sugar manufacturer, and they decide to adjust their machine that pours the sugar, so that only 0.6% of customers will get less than 1,000 grams of sugar. The second adjustment is to decrease the standard deviation by making the machine pouring sugar more accurate. Using the old mean of 1,010 grams, what is the standard deviation that would result in only 0.6% of customers cheated?

Round your answer to two digits (e.g. 52.17)