Job Recruitment Website - Job information - (20 14? An airline recruited flight attendants and recorded the heights of 6 boys and 9 girls who came to apply. The data are stems and leaves.
(20 14? An airline recruited flight attendants and recorded the heights of 6 boys and 9 girls who came to apply. The data are stems and leaves.
(1) The average height of six boys is176+173+178+180+1936 =/kloc-. The nine girls are 162, 163, 166, 167, 168, 170, 176,/kloc-.
(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.
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