exam Maths Puzzle Numerical Ability

i am confused on how to get the answers...do they have more than one answer each?

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exam Other Question

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. :( Represent an altitude of 2,400 feet above sea level as an integer