Mathematics, 21.07.2019 02:30 asiababbie33
X13 16 18 21 23 25 26 31 p(x) .07 .21 .17 .25 .05 .04 .13 .08 the mean of the discrete random value variable x is the 20.59. what is the variance of x? round your answer to the nearest hundredth a 27.89 b27.89 c33.15 d23.18
Answers: 1
![\mathbb E[X^2]=\displaystyle\sum_x x^2p(x)=13^2\cdot0.07+\cdots+31^2\cdot0.08\approx447.13](/tpl/images/0113/9452/f49b8.png)
is![\mathbb V[X]=\mathbb E[X^2]-\mathbb E[X]^2\approx447.13-20.59^2\approx23.18](/tpl/images/0113/9452/28a6c.png)
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X13 16 18 21 23 25 26 31 p(x) .07 .21 .17 .25 .05 .04 .13 .08 the mean of the discrete random value...
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