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+0  
 
+1
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avatar+381 

gotta get these done by midnight...stressed out lol

 

The graph show the probability distribution of a random variable.

What is the value of P(4≤X≤8)?

 

0.40

0.45

0.50

0.55

 

Thanks much. Just scramblin

 May 28, 2019
 #1
avatar+101086 
+2

We can break this into  3 areas

 

P(5 ≤ X ≤ 8)  = a  rectangle  with a width of 3  and height of .15   = 3(.15)  = .45

 

P( 4 ≤ X ≤ 5)  =  a triangle  with a base of 1  and a height of (0.15 -0.05) = .10

So....this area  =   (1/2)(1)(.10)  = .05

 

And  another rectangle with a width of 1 and height of .05  = (1) (.05) = .05

 

So

 

Adding these areas

 

P( 4 ≤ X ≤ 8 )  =  .45 + .05 + .05   =  .55

 

 

cool cool cool

 May 28, 2019
 #2
avatar+381 
+2

Thank you! Using the shapes as references makes better sense to me

PhoenixForever  May 28, 2019
 #3
avatar+101086 
+1

OK.....glad to help  !!!

 

 

cool cool cool

CPhill  May 28, 2019

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