The following data shows the annual salaries (in thousands of US dollars) for teachers around the world
with 15 years of experience. Which interval has the
highest frequency if the intervals are 0-10, 11-20, 21-30,
31-40, 41-50, 51-60, 61-70?
Luxembourg (69); Australia (45); South Korea (55);
Estonia (9); Ireland (53); Japan (48); Netherlands (45);
USA (44); Germany (53); Greece (32);
Scotland (48); Israel (17)