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January 25, 2015

January 25, 2015

Posted by **LadyJustice85** on Wednesday, June 1, 2011 at 11:33am.

X 0 1 2 3 4

P(X) 0.07 0.20 0.38 k 0.13

(a) Find the missing probability value of k

(b) Find the mean of X

(c) Find the standard deviation of X

- Statistics -
**Mgraph**, Wednesday, June 1, 2011 at 12:17pma)k=1-(0.07+0.20+0.38+0.13)=0.22

b)M(X)=0*0.07+1*0.20+2*0.38+3*0.22+4*0.13=

=2.14

c)M(X^2)=0*0.07+1*0.20+4*0.38+9*0.22+

+16*0.13=5.78

The standard deviation=

=sqrt(M(X^2)-M(X)^2)=1.10

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