+0

# I need help with Probability

0
171
3
+126

can i please get help on how to work this out

Nov 21, 2018

#1
+129
+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
+702
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
+101322
+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

Nov 21, 2018