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\subsection{6.19}  a) Using a z score table for 1.76, probability of being less than 1.76 is 0.9608 or about 96$\%$.\\  b)To find probability of 1.76 or more, just take the compliment.$1-0.9608=0.0392\approx4\%$\\  c)To find the probability in this range subtract the probability of -1.03 from 1.3, .1515-0.0968=0.0547$\approx5\%$ .1515-0.0968=0.0547$\approx5\%$\\  \subsection{6.23}  following the guided exercise\\  find z-score for 675. $z=\frac{675-500}{100}=1.75$\\