Hi,

mean of 60 and a standard deviation of 8

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

P(44 ≤ x ≤ 68) = normalcdf(44,68,60,8)

P(52≤ x ≤ 76) = normalcdf(52,76,60,8)

0r

P(44 ≤ x ≤ 68) = NORMSDIST(1) - NORMSDIST(-2) =  .8413 - .0228

P(52≤ x ≤ 76) =  NORMSDIST(2) - NORMSDIST(-1) =  .9772 - .1587 

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