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\textbf{One of the values in a normal distribution is 43, and its z-score is 1.65. If the mean of the distribution is 40, what is the standard deviation of the distribution?} 
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\textbf{Z = 1.65 = $\frac{43-40}{\sigma}$ → $\sigma = \frac{3}{1.65}=1.82$} 