The ages of the members of four teams are summarized below. Answer the questions about them.

Team A: Therangeof ages is9and themeanage is34.

Team B: The range of ages is15and the mean age is31.

Team C: The range of ages is13and the mean age is33.

Team D: The range of ages is11and the mean age is28.

(a)Based on the information above, which team has the oldest members on average?

Team A

Team B

Team C

Team D

(b)Based on the information above, which team's ages have the most variability?

Team A

Team B

Team C

Team D