Answer
(a) 0.0040
(b) 0.6979
(c) 0.01491
(d) (a) and (b) are unusual because they are less than 0.05
Work Step by Step
Input numbers in TI84 Calculator
(a) normlacdf(10, 56.5, 64.2, 2.9) = 0.0039 = 0.0040
(b) normalcdf(61, 67, 64.2, 2.9) = 0.6979
(c) normalcdf(70.5, 100, 64.2, 2.9) = 0.0149
(d) answered above