Question 1050445
mean = 278 days and standard deviation = 16 days.
​a) P(>290)
 TI syntax is normalcdf(smaller, larger, µ, σ).
P(>290) = normalcdf(290, 9999, 278, 16) Note: Placeholder 9999
b)P(274 ≤ x ≤ 286)= normalcdf(274, 286, 278, 16)
c) P(x ≤ 258) = normalcdf(-9999, 258, 278, 16)
d) P(x < 238) = normalcdf(-9999, 238, 278, 16)
Since this is a continuous function, we have P(x < 238) = P(x &#8804; 238).