Answer to Question #216196 in Statistics and Probability for Muniru

Question #216196
If sample space S={e1,e2,e3,e4}, find P(e1) if P(e2)=1/5 and P(e3)=1/3
1
Expert's answer
2021-07-14T15:49:43-0400

S={e1,e2,e3,e4}S=\{e_1,e_2,e_3,e_4\}


Given,

P(e2)=1/5P(e3)=1/3P(e_2)=1/5\\P(e_3)=1/3


and we know that

P(e1)+P(e2)+P(e3)+P(e4)=1     P(e1)+15+13+P(e4)=1     P(e1)+P(e4)=11513=715P(e_1)+P(e_2)+P(e_3)+P(e_4)=1\\\ \\\implies P(e_1)+\dfrac{1}{5}+\dfrac{1}{3}+P(e_4)=1\\\ \\\implies P(e_1)+P(e_4)=1-\dfrac{1}{5}-\dfrac{1}{3}=\dfrac{7}{15}


Let P(e4)=115P(e_4)=\dfrac{1}{15}


So, P(e1)=715115=615P(e_1)=\dfrac{7}{15}-\dfrac{1}{15}=\dfrac{6}{15}


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