Question 847125
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Hi,
'extracting' necessary problem solving info from the 'Words' 
mean = 23.5 and SD = 3.6
Using TI Calculator
a. P(15&#8804;x &#8804;22) = normalcdf(smaller, larger, µ, &#963;) = normalcdf(15 22, 23.5, 3.6)
b. P(x<18 0r x >.25) = 1 - P(18&#8804;x &#8804;25)= 1 - normalcdf(18, 25, 23.5, 3.6)
c. NO, over 2 SDs from mean  ( |15-23.5| =  8.5)