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In a certain district's second year high school mathematics exam, the scores of 200 randomly selected students all ranged between 50 and 100 points. The scores were divided into 5 groups as follows: the first group, scores greater than or equal to 50 and less than 60; the second group, scores greater than or equal to 60 and less than 70; ... the fifth group, scores greater than or equal to 90 and less than or equal to 100. Based on this, a frequency distribution histogram as shown in the image was plotted. How many of these 200 students scored greater than or equal to 80 and less than 90? _______ students