The graph shows the changes in progesterone concentration in the blood plasma of a healthy female over a typical 28-day menstrual cycle.
Calculate the mean rate of increase in progesterone concentration between day 14 and day 20.
1.8 nmol L−1 day−11.8\text{ nmol L}^{-1}\text{ day}^{-1}1.8 nmol L−1 day−1
6.0 nmol L−1 day−16.0\text{ nmol L}^{-1}\text{ day}^{-1}6.0 nmol L−1 day−1
6.3 nmol L−1 day−16.3\text{ nmol L}^{-1}\text{ day}^{-1}6.3 nmol L−1 day−1
36.0 nmol L−1 day−136.0\text{ nmol L}^{-1}\text{ day}^{-1}36.0 nmol L−1 day−1
