exam Maths Puzzle Numerical Ability

Calculate the range and the standard deviation for each numbers

19,9,2,5,19,8,5,6,12,4,17,1,7,6,9,3,20,1

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exam Other Question

Find the what what and the what? please help me!!! Find (a)the directrix,
(b) the focus and (c) the roots of the parabola y = x^2 - 5x + 4
(a)_________________
(b)_________________
(c)_________________ how to prove taht the diagnols of a restangle are equal through a practical activity