Normal Distribution Problem I am struggling with solving these problems. I am not sure with formulas to use. 2) Suppose

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answerhappygod
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Normal Distribution Problem I am struggling with solving these problems. I am not sure with formulas to use. 2) Suppose

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Normal Distribution Problem
I am struggling with solving these problems. I am notsure with formulas to use.
2) Suppose the amount of time customers have to wait for theirorder at a coffee shop has an approximate normal distribution witha mean of 129 seconds and a standard deviation of 17.3 seconds.
a) What is the z-score? (I am not sure howto find a z-score without an x value.)
b) What proportion of the waiting times isshorter than the z-score you found? Drawa sketch to illustrate the solution. ( I am not surewhat type of sketch I'm supposed to use)
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