d Calculate P250 Solutiond z1 lower z score 25 z2 upper z

Solution

d)

z1 = lower z score =    -2.5      
z2 = upper z score =     1.5      
          
Using table/technology, the left tailed areas between these z scores is          
          
P(z < z1) =    0.006209665      
P(z < z2) =    0.933192799      
          
Thus, the area between them, by subtracting these areas, is          
          
P(z1 < z < z2) =    0.926983133   [ANSWER]

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e)

Using a table/technology, the right tailed area of this is          
          
P(z >   2.5   ) =    0.006209665 [ANSWER]