A sample of 10 drivers shows the time that they spent (in minutes) stopped in rush-hour traffic on a specific snowy day last winter. Round your answers to one decimal place. 45 53 53 54 55 60 61 63 74 75 a) Find the range b) Find the standard deviation. Express your answer correct to 1 decimal place c) What is the interval of usual values? Use z-score to determine the interval. (Write the numbers separated by a coma. Leave one space after the coma. Use one decimal place where necessary). d) What is the 43rd percentile? Do not include units