In a section of a calculus class, test scores were randomly selected and the following scores were recorded: 74 73 77 77 71 68 65 77 67 66 Assuming the data represents a sample, calculate the mean, median, mode, standard deviation, variance and range for the data. Round to two decimal positions if necessary. a. Mean: b. Median: c. Mode: d. Standard Deviation: e. Variance: f. Range