We have a survey.
It is done to students randomly chosen.
The question gives a Yes/No answer, so the result of the survey is a sample proportion to represent how many of the students spend the majority of the money in music.
From the pie chart we can see that this proportion is p = 0.5.
The claim is that students spend the majority of their money buying music.
In this case, this sample won't be enough evidence as the sample proportion is not greater than 0.5 so it is not the majority.
To have this sample as evidence for the claim, p should be higher than 0.5, higher enough so that it is statistically significant.
Even though, the claim is a valid claim and the sample is taken randomly from the population (the students), so the results are not biased.
Answer:
The claim is probably valid. The sample is not biased because the sample includes randomly selected members of the population and the question is not biased.