Questions 8-10 should be answered using the following case study John has determined that the mean investment was $500 (in thousand) and standard deviation of $30 (in thousands) for clients that took his advice when investing. 8) What percent of companies have a mean investment greater than $505 (thousands)? Round to an integer number 9) What is the investment range for the middle 80% of the investments? Round to the nearest tenth. 10) What percent of companies have a mean investment smaller than $480 (thousands)? Round to the nearest percent