Which of the following statements about the mean are true? Check all that apply. It can be used for data that are measured on a nominal scale. There can be more than one. It is algebraically defined (that is, there is an equation you can use to calculate its value). It is easily influenced by extreme scores. Which of the following statements about the mean are true? Check all that apply. It can be used for data that are measured on a nominal scale. There can be more than one. It is algebraically defined (that is, there is an equation you can use to calculate its value). It is easily influenced by extreme scores.