4. Researchers are developing a new anxiety measure. They gather data from a large number of participants and find that scores are normally distributed with a mean of 30 and a standard deviation of 4. They want to set cut-off points for their scale that indicate low anxiety, average anxiety, and high anxiety. Help the researchers find their cut-off scores by calculating the anxiety scores that 25% of participants score below, 50% of participants score below, and 75% of participants score below. a. 25% of participants scored at this number or below: b. 50% of participants scored at this number or below: c. 75% of participants scored at this number or below