Question 407358
A)


Recall that the z score is {{{z=(x-mu)/sigma}}}, so the z score of x=70.3 is {{{z=(70.3-71.7)/(3.95)=-0.354}}}


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B)


Yes it can be used to calculate probabilities. Your book will most likely have standard normal tables in the back, which will help you calculate probabilities.



For example, a common value in the table is P(Z < 0) = 0.5



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