Find the probability. A die is rolled 20 times and the number of twos that come up is tallied. Find the probability of getting exactly five twos.
A. 0.129

B. 0.921

C. 0.003

D. 0.083

Question

Find the probability. A die is rolled 20 times and the number of twos that come up is tallied. Find the probability of getting exactly five twos.  
 A. 0.129  
 
 B. 0.921  
 
 C. 0.003  
 
 D. 0.083

anonymous · Answer

exactly 5 twos for this binomial probability 
probability you get a 2 on any one toss is $\frac{1}{6}$ probability you do not is $\frac{5}{6}$ use 
$$\dbinom{20}{5}\times (\frac{1}{6})^5\times (\frac{5}{6})^{15}$$ and a calculator

anonymous · Answer

can you just tell me the answer ?

anonymous · Answer

http://www.wolframalpha.com/input/?i=%2820+choose+5%29+%281%2F6%29%5E5%285%2F6%29%5E15

anonymous · Answer

?

anonymous · Answer

Math Is so hard for me  .