Hi,

'extracting' necessary problem solving info from the 'Words' 

mean = 23.5 and SD = 3.6

Using TI Calculator

a. P(15≤x ≤22) = normalcdf(smaller, larger, µ, σ) = normalcdf(15 22, 23.5, 3.6)

b. P(x<18 0r x >.25) = 1 - P(18≤x ≤25)= 1 - normalcdf(18, 25, 23.5, 3.6)

c. NO, over 2 SDs from mean  ( |15-23.5| =  8.5) 

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