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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exam Other Question
Solve: 17-4x/12=5






An 80-pound grass seed mixture is 30% bluegrass seed. How many pounds of seed containing no bluegrass seed (0%) should be added to the seed mixture for a resulting blend that is 20% bluegrass seed? Answer the following three problems using Addition, Graphing, or Substitution Method. Each method will be used once, and indicate which method you used.

x+3y+4
x=3


1/5x+1