A cumulative-frequency curve shows the waiting times of 80 passengers boarding Star Cruise.
Use the curve to estimate
the median waiting time,[1]
the interquartile range of the waiting time,[2]
the percentage of passengers who took at least 30 minutes to board.[2]
Another 80 passengers boarding Diamond Cruise had the same median but a higher interquartile range. Describe how its cumulative-frequency curve would differ.[1]
Two Star Cruise passengers are selected at random. Find the probability that
both waited less than 25 minutes,[1]
one waited less than 25 minutes and the other waited at least 36 minutes.[2]