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1.https://prnt.sc/mxf9r7

2.https://prnt.sc/mxfaew

3.https://prnt.sc/mxfass

4.https://prnt.sc/mxfc9c

 Mar 13, 2019
 #1
avatar+102355 
+1

First one :   The top left table

 

 

Second one : 

 

The total number of students =  95 + 105 + 145 + 220 = 565

 

% 7 - 9  =   95/565 =  .168

 

The top right table must be correct

 

 

Third one :

 

P(-1/3) < 0

Sum of probabilities = 2/3

 

 

Last one :

 

P( x = 2  or x = 0)  =  P(x = 2) + P( x = 0) - P(x=2 and x = 0)  =

 

0.1 + 0.3  - (0.1 * 0.3)  =

 

0.4 - .03 =

 

0.37

 

 

cool cool cool

 Mar 13, 2019

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