+1 for

B,

Question stem basically asks us if the average of (3, 8, a, 17, 3a) is less than 8

On re-writing we get \(\frac{28+4a}{5}\) < 8

\(28+4a < 40\)

\(4a<12\)

\(a<3\)

Statement 1 states a>2, which can mean a can take values 2.1, 2.5, 3, 3.5 etc. since question stem does not mention a to be an integer. Not sufficient.

Statement 2 states \(a^2 <9\)

which means that a is either less than 3 or -3, either way it will always be less than 3. Sufficient.

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