Given p( -d < z < d ) = 0.5408, find d. (standard normal distribution)

So base in your given that the function P(-d<z<d)=0.5408, the ask is to find the value of D by standard normal distribution. Base on my calculation and analyzing the equation the possible answer to this question is D=0.2704, i hope you are satisfied with my answer and feel free to ask for more

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1.17+3.99a. you combine the terms with a to create 3.99 and the 1.17 stays because it has no like terms or a variable