Find the area under the standard normal curve between z 171

Find the area under the standard normal curve between z = 1.71 and z = 1.24, P(-1.71

Solution

2.

z1 = lower z score =    -1.71      
z2 = upper z score =     1.24      
          
Using table/technology, the left tailed areas between these z scores is          
          
P(z < z1) =    0.043632937      
P(z < z2) =    0.892512303      
          
Thus, the area between them, by subtracting these areas, is          
          
P(z1 < z < z2) =    0.848879366   [answer]

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3.

z1 = lower z score =    -2.3      
z2 = upper z score =     1.53      
          
Using table/technology, the left tailed areas between these z scores is          
          
P(z < z1) =    0.01072411      
P(z < z2) =    0.936991636      
          
Thus, the area between them, by subtracting these areas, is          
          
P(z1 < z < z2) =    0.926267526   [answer]