Which graph represents a density curve, and why?
A
neither graph A nor graph B, because, even though both curves are above the horizontal axis, neither graph has an area of 1B
both graph A and graph B, because both curves are above the horizontal axis, and both areas are positiveC
graph B only, because the curve is above the horizontal axis, and the area under the curve is equal to 1 point 5 7D
graph A only, because the curve is above the horizontal axis, and the area under the curve from 2 to 7 is 1