Adding the sentence provides context and support for the writer's claim about teenagers being viewed as lazy.
The sentence in question is: 'As this story shows, many students from working-class families have to contend with helping out at home, contributing financially to the family, poor study environments and a lack of support from their families.'
I would recommend adding this sentence after sentence 5 because it provides additional context and support for the writer's claim about teenagers being viewed as lazy. It explains that many students from working-class families have various responsibilities and challenges that may prevent them from working during the summer.
By adding this sentence, the writer strengthens their argument and provides a more comprehensive understanding of why some teenagers may choose to spend their summers differently.