Final answer:
The estimated probability that Jenn's carpool ride will be late tomorrow is 30%.
Step-by-step explanation:
The estimated probability that Jenn's carpool ride will be late tomorrow can be found by calculating the relative frequency of her rides being late in the past.
Given that her carpool ride has been late 6 days out of the past 20 days, the relative frequency of her ride being late is 6/20 = 0.30 or 30%. Therefore, the estimated probability of her ride being late tomorrow is 30% (Option D).