exam Maths Puzzle Numerical Ability

Find the value of z, such that P[ -z < Z < z ] = 0.5468

Last one I promise, appreciate all the help you guys have given me to prepare for my tests :)

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can someone please help me with this question:

If a function has an odd degree and a negative leading coefficient, then what is the minimum number of zeroes it must possess? Write the equation of the line passing through each of the given pairs of points. Write results in slope-intercept form, where possible.
The equation is (2,-3) and (2,4)