# math

posted by
**Nahla**
.

An experiment consists of rolling a weighted die. The probability of rolling each number is: Pr[1]=0.2 , Pr[2]=0.15 , Pr[3]=0.25 , Pr[4]=0.15 , Pr[5]=0.05 , and Pr[6]=0.2 . On the first roll, you record if the number is Small (1,2) or Large (3,4,5,6). If the first number is Small, then on the second roll you record if the number is a 4 or not. If the first number is Large, on the second roll you record whether the number is Small or not. So, some typical outcomes would be S4 (small number rolled, then 4) or LL (large number rolled, then another large number). Draw a tree diagram and use it to answer the following questions.

What is Pr[LL]?

What is Pr[(not4)on second roll/S on first roll]?

What is Pr[S on second roll/L on first roll]