Answer:
Step-by-step explanation:
Let X be the heights of adult men in America and Y that of women in America
X is N(69.8, 2.69) and Y is N(64.8,2.53)
a) Man is 6 feet 3 inches = 75 inches
Z score =
b) Prob = 0.5-0.4686 = 0.0314
3.14% are shorter than him
c) Y score = 5 ft 11 inches = 71 inches
Z=
d) Prob (Z>2.45) = 0.5-0.4929=0.0071
Nearly 0.71% people are taller than 5 ft 11 inches.