An HR manager is analyzing the salaries of employees in her department. She begins by adding the salaries of the 15 employees she's interested in together. She then divides that total by 15, to find the mean salary for those employees. After finding the mean, she plots the salaries of all 15 employees on a salary line to see how far those salaries are from the mean. She finds that all of the individual employee salaries are very close to the mean salary, indicating that the salary data has: a little variance b a lot of variance c no standard deviation d no mode