Make question and answer the solve of disaster

Question :
Merapi disaster that occurred some time ago has left a deep trauma for the people living in the slopes of Merapi. Many of the casualties caused by these events. A family is losing her mind. From past experience in mind that the chances of the child's death was 0.02. If a volunteer opportunity estimating the child's death and the true estimate is 0.78 and the estimated odds that the child's life and forecast is wrong is 0.06. Calculate the odds that the approximate results for the child is the child completely dead. 
Answer :
P (A) = chance of the child's death
P (A ') = the life chances of children
P (B | A) = chance of dying children and the proficiency level estimate of true volunteers
P (B '| A) = chance the child is dead and one estimate of volunteers
P (B | A ') = the life chances of children and volunteers correctly estimated
P (B '| A') = the life chances of children and volunteers incorrect estimates 
P(A)= 0,02
P(A’)= 1-0,02=0,98
P(B|A)=0,78
P(B’|A)=1-0,78=0,22
P(B’|A’)=0,06
P(B|A’)=1-0,06=0,94
P (B) = chance the child is completely dead 
P(B) =P(A). P(B|A) + P(A’). P(B’|A’)
= 0,02 . 0,78 + 0,98 . 0,06
= 0,0744 
So the volunteers estimate the odds that the child actually died is 0.0744.

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