<PRE><B>Question 1064388</B>
The Normal distribution z-score is
:
z-score = ( X - mean ) / standard deviation
:
z-score = ( 38.95 - 23.7 ) / 6.1 = 2.5
:
Note to determine the Normal distribution probability ( X &lt; 38.95 ) we use our calculated z-score and the table of z-scores
:

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