Kendra wants to know the average height of first-year high school students in her town. She randomly picked 25 male and 25 female students from each of the 10 high schools in her town. From the data she collected, she concluded that the average height of first-year high school students in her town is 5 feet, 7 inches. How many students in total were included in her representative sample?

Kendra picked 25 male and 25 female students from each of the 10 high schools, which means she picked a total of 25 + 25 = <<25+25=50>>50 students per school.

So the total number of students Kendra picked is 50 x 10 = <<50*10=500>>500.
Therefore, Kendra included a total of 500 students in her representative sample.