"when the population standard deviation is unknown, sample size is less than 30, and the population has a normal or near-normal distribution"

Madeline takes her family on a boat ride. going through york canal, she drives 6 miles in 10 minutes. later on as she crosses stover lake, she drives 30 minutes at the same average speed. which statement about the distances is true?

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

Which of the following is an example of conditional probability