Once a survey has received responses from more than 3 recipients, or has expired, you will be able to see the responses.
In the 'Surveys & Polls' sidebar option, Click 'View' to be brought to Surveys published.
Here you will be shown the survey questions, and the answers beside them. For likert scale questions, the answers will have the percentages of respondents that chose certain answers, and for text or multiple choice you are able to click 'View' or the eye icon to see the list of responses.
The dotted line shows the average answer across all responses for that question in likert scale responses. This corresponds to the headings across the top, which list likert scale answers, and the colours correspond to the segments of the bars in the response section.