The viscosity of a bolt lubricant is supposed to average 600 centistokes at 25 C. Thirty-Six random samples of lubricant are collected and the average viscosity is found to be 613 centistokes. The standard deviation of the lubricant is known and given as = 20 centistokes. Determine if the bolt lubricant average is 600 centistokes. a.) State the appropriate hypothesis for this experiment that the viscosity is higher than 600 centistrokes. b.) Test the hypothesis using = 0.043. State your conclusions.