Hi,

TI syntax is normalcdf(smaller, larger, µ, σ).

Mean 56  SD = 4

a. Between 53 and 59 years old: 

P(53 ≤ x ≤ 59)= normalcdf(53, 59, 56, 4)=.5467

 b. Between 58 and 63 years old:  

P(58 ≤ x ≤ 63)= normalcdf(59, 63, 56, 4) = .1857

 c. Between 50 and 55 years old:  

P(50 ≤ x ≤ 55)= normalcdf(50, 55, 56, 4) = .3345 

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