Several students in Ashton's class were randomly selected and asked how many text messages they sent yesterday. Their answers were 1,0,10,7,13,2,9,15,0,3.
Well, you wrote a list of 10 numbers, and you called the list "Their answers".
If their answers are written as a list of 10 numbers, and if there's no hanky panky going on that you're not telling us, then the 10 answers came from asking 10 students.