Fig 1

Make a histogram of the total number of steps taken each day
Fig 2

Make a histogram of the total number of steps taken each day and
Calculate and report the mean and median total number of steps taken per
day.
Fig 4

Make a panel plot containing a time series plot (i.e. type = "l") of the
5-minute interval (x-axis) and the average number of steps taken,
averaged across all weekday days or weekend days (y-axis)
Fig 3