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what is the z score of x=12, if it is two standard deviations to the right of the mean?
what is the z score of x = -2, if it is 2.78 standard deviations to the right of the mean?
in normal distribution, x=3 and z= 0.67. this tells you that x=3 is how many standard deviations to the right of left of the mean?
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