Saved Bookmarks
| 1. |
A pair of dice is thrown 4 times. If getting a doubletis considered a success, find the probability distribution of the number ofsuccesses and hence find its mean. |
|
Answer» `P(S=0)=5/6*5/6*5/6` `P(S=1)=3C_1*5/6*5/6*5/6` `P(S=2)=3c_2*5/6*1/6*1/6` `P(S=3)=1/6*1/6*1/6` Mean=`sumP(6)S` `=P(s=0)*0+P(s=1)*1+P(s=2)*8+P(s=3)*3` `=0+(3*5*5)/(6*6*6)+(3*5*1*2)/(6*6*6)+(3*1)/(6*6*6)` `(75+30+3)/(216)=108/216=1/2` |
|