Some newer phones provide a screen time summary, which shows the amount of screen time for a user in a given week. A student would like to estimate the mean screen time for all phone users. She asks a random sample of 50 students at her school to share their screen time for the past 24 hours. The mean screen time for the chosen students is 2.73 hours. Which statement is an appropriate interpretation of the results? All students probably have screen times close to 2.73 hours.
To obtain a better estimate of mean screen time, more students should be surveyed.
Because of undercoverage, 2.73 likely underestimates the mean screen time of all phone users.
2.73 hours is a suitable estimate for mean screen time of all phone users because a random sample was taken.

Answer is C and i have the rest of the answers (1-5) (6-10 will be on other question)

Just type "Residents of a community currently pay a fee for recreational services in their neighborhood, such as tennis courts, running trails, and a pool. To assess whether there is support for raising the fee for the upcoming summer, a random sample of 50 residents is contacted and asked this question: "Would you support a $10 increase in the recreational fee to support programs for the health and well-being of children in the community?” Of the 50 residents contacted, 42 approved of the fee increase. Which statement describes a likely source of bias present in the survey results?"