(2) Men have 176, 178,180 in the range of [174, 182]; If the female height is in the range of 166, 167, 168, 170, then
The possible values of x are 0, 1, 2, so
p(X = 0)= c24c 27 = 27； p(X = 1)= c 13c 14c 27 = 47； P(X=2)C23C27= 17
What is the distribution list of x? x？ 0 ? 1 ? 2? p？ 27 ? 47 ? The expected value of 17 is 0× 27+1× 47+2×17 = 67.