The u. s. has a population of 310,735,072 people. if there were a total of 63,494,576,914 liters of fresh water in the u. s., how much would be readily available for individual use? (assume the water is evenly distributed among all u. s. people and remember that not all fresh water is readily available)

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Needmax recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

I'm confused on this could anyone me and show me what i need to do to solve it.