"Empirical Rule needed" It is known that when a specific type of radish is grown in a certain manner without fertilizer the weights of the radishes produced are normally distributed with a mean of 47g and a standard deviation of 10g. a) Approximately 68% of radishes grown without fertilizer weigh between and b) A radish weighing at is at the 2.5th percentile of radishes grown without fertilizer. c) Approximately % of radishes grown without fertilizer weigh between 27g and 67g