+0  
 
0
91
3
avatar+122 

can i please get help on how to work this out

 Nov 21, 2018
 #1
avatar+128 
+1

So first, we find the probability that the highly demented dice will land on a 3. You will get 0.12.

If you roll the dice once, the probability of landing on a 3 or 4 is 0.12 + 0.21 = 0.33.

Next up,

0.33 = 33/100.

33/100 * 300 == 99

If you want to estimate, then you round 0.33 to 1/3, and 1/3 * 300 is easily 100.

 Nov 21, 2018
 #2
avatar+512 
0

For estimation I'd already say Face 3 is around a 0.1 probability because \(0.13+0.05\) is around 0.2, \(0.21\) is around \(0.19\) which is around 0.2, and 0.3 is 0.3. Adding we get 0.9 and 1-0.9=0.1

\(0.1+0.2=0.3\) and \(300 \times 0.3=90\).

Therefore I'd estimate around 80-100 times.

 

You are very welcome!

:P

 Nov 21, 2018
 #3
avatar+96067 
+1

The sum of the probabilities = 1

 

So

 

p(3)   = 1 - .13 - .05 - .21 - .19 - .3   =  .12

 

So 

 

P ( 3 or 4)    =  [ .12 + .21 ]  =  .33  =   1/3

 

So...

 

.1/3 * 300   =  100 times

 

 

 

cool cool cool

 Nov 21, 2018

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