Chrome File Edit View History Bookmarks poole wn Help o/Cless Notes: 0. X es/las

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Chrome File Edit View History Bookmarks poole wn Help o/Cless Notes: 0. X es/last?dep- 16598932 -2 02 or·x) 0.3 0.2 0.1 0.2 0.2 Compute the mean, varlance, and standard devistion of X. (Round your answers to two decimal places.) standard deviation Bubmi Answer Save Progres Practice Another Version The following histograms represent the probability distributions of the random variables X and Y. Determine by inspection which p variance (b) 35 T 25- .15 Figure(a) has the larger variance Figure (b) has the larger variance. The variances are the same. tt is not possible to determine the variance from the histograms Fnding the mean fro .docx .5-7.6in-Class Not.docx .3-7.4 in class note..docx

Explanation / Answer

Ans:

1)mean=-4*0.3-2*0.2+0*0.1+2*0.2+4*0.2

=-1.2-0.4+0+0.4+0.8

=-0.4

mean=-0.4

Variance=9.44

standard deviation=sqrt(9.44)=3.07

b)figure (b) has larger variance.

x p(x) x.p(x) (x-(-0.4))^2*p(x) -4 0.3 -1.2 3.888 -2 0.2 -0.4 0.512 0 0.1 0 0.016 2 0.2 0.4 1.152 4 0.2 0.8 3.872 Total 1 -0.4 9.44

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