You can put this solution on YOUR website! Find the value of z such that 45% of the distribution lies between it and the mean
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Such a z-value would have a 5% tail to the right or a 5% tail to the right.
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Ans: invNorm(0.05) = -1.645
Because of symmetry the z-value could also be +1.645.
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Cheers,
Stan H.