Trent wanted to know if there was a connection between his coffee consumption and how well he slept that night.

for weeks, trent recorded how many cups of coffee he drank in the morning and how many hours he slept that night. the probability that a day is one when he drank exactly 1 cup of coffee is 0.71, the probability that it is one when he slept exactly 8 hours is 0.61, and the probability that it is one when he drank exactly 1 cup of coffee or is one when he slept exactly 8 hours is 0.89.

what is the probability that a randomly chosen day is one when he drank exactly 1 cup of coffee and is one when he slept exactly 8 hours?