4. Jan and Jackie check out the same number of library books. Jan turns in 4 books
after 3 weeks. Jackie returns 2 books that week and 4 books later. Write algebraic
expressions and draw bar models to represent the books Jan and Jackie have left. Do
they have the same number of books left? Justify your answer

Now 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.