Answer:896.9
Step-by-step explanation:
Let x denotes excess premium over claims
, There are two possibilities
(i)Only husband survives
This can be possible with a possibility of 0.01
Claims=10,000
Premium collected
Thus x=1000-10,000=-9000
(ii)Both husband and wife survives
This can occur with a probability of 0.96
Here claims will be 0 as both survives
Premium taken=1000
thus x=1000
The probability that the husband survives is the sum of above cases
=0.96+0.01=0.97
Hence the desired conditional Expectation 
Answer:
x = 15
Step-by-step explanation:
2 = -7/4 + 1/4x
+7/4 +7/4 Add 7/4 to both sides
15/4 = 1/4x Divide both sides by 1/4
15 = x
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Factors of 21 are : 1,3,7,21....yes, this is correct...true