Jasmine drew this display to represent the amount of time people spent completing an online survey Which statements are true? Check all that apply. To be a density curve, the area between the x-axis and the curve must be 1. Online Survey Completion Relative Frequency This cannot be a density curve because it is not symmetric This could be a density curve because all points on the curve are above the x-axis. 3 4 5 00 7 Time (min) O This cannot be a density curve because it contains straight lines. O This cannot be a density curve because some of the values are negative.