The probability P(c < x < d) is the area under the curve, above the x-axis, and:

1. Interval probability is read off the picture directly. 2. P(c < x < d) is the area under the curve, above the x-axis. 3. That area lies to the right of c and to the left of d. 4. It is the strip of the curve between the two values. _Source: OpenStax Introductory Statistics 2e (CC BY 4.0), Ch 5 'Continuous Random Variables', sections 5.1-5.3_