exam Maths Puzzle Numerical Ability

Find the five-number summary of the following set of numbers.

0.16, 0.08, 0.27, 0.20, 0.22, 0.32, 0.25, 0.18, 0.28, 0.27

HELP can someone please explain this five number thing to me? I do not understand this either. :(

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exam Other Question
3x+6y =12 X^2-6x+4>0. Problem is, the 4 and -6 are not factorable. I tried using quadratic formula and -6^2 is an imaginary #. I ended up getting 3+ or - square root 6i-16.