Toni drives a boat 15 km/h upstream and then turns around and drives 25 km/h back downstream to her starting point. If her total driving time is 4 hours, for how long does she drive upstream? Write and solve an
equation to determine the answer.

What is the range of the data below? .8090100

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Cor d? ? me ? max 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.