# Thread: Need help on a couple of questions!

1. ## Need help on a couple of questions!

1)Two integers {1, 2, 6, 7, 9} are chosen at random without replacement. Let X denote the sum of the two integers.
Obtain the probability distribution of X.

2) An insurance policy pays $800 for the loss due to theft of a canoe. If the probability of theft is assessed to be .05, find the expected payment. If the company charges$50 for the policy, what is the expected profit per policy?

3)GESCO Insurance Company charges a $350 premium per annum for a$100,000 life insurance policy for a 40‐year‐old
female. The probability that a 40‐year‐old female will die within 1 year is .002.

-Find the mean when x be a random variable that denotes the gain of the company for next year from a $100,000 life insurance policy sold to a 40‐year‐old female. 2. Originally Posted by mattch 1)Two integers {1, 2, 6, 7, 9} are chosen at random without replacement. Let X denote the sum of the two integers. Obtain the probability distribution of X. 2) An insurance policy pays$800 for the loss due to theft of a canoe. If the probability of theft is assessed to be .05, find the expected payment. If the company charges $50 for the policy, what is the expected profit per policy? 3)GESCO Insurance Company charges a$350 premium per annum for a $100,000 life insurance policy for a 40‐year‐old female. The probability that a 40‐year‐old female will die within 1 year is .002. -Find the mean when x be a random variable that denotes the gain of the company for next year from a$100,000 life insurance policy
sold to a 40‐year‐old female.
1) Where are you stuck? To get a sum of 3 you can choose (1, 2) or (2,1 ). Therefore Pr(sum = 3) = 2 (1/5)(1/4) etc.

2) and 3) Where are you stuck? Apply the definition of expected value.

If you need more help, please show what you have tried and say where you are stuck?

3. Originally Posted by mr fantastic
1) Where are you stuck? To get a sum of 3 you can choose (1, 2) or (2,1 ). Therefore Pr(sum = 3) = 2 (1/5)(1/4) etc.

2) and 3) Where are you stuck? Apply the definition of expected value.

If you need more help, please show what you have tried and say where you are stuck?
For 2) and 3) I'm just not sure even where to start. I'm not sure of what expected value means.

I've done a couple other questions from the same set, but they had examples in my textbook. These questions didn't have any examples.

4. Originally Posted by mattch
For 2) and 3) I'm just not sure even where to start. I'm not sure of what expected value means.

I've done a couple other questions from the same set, but they had examples in my textbook. These questions didn't have any examples.
Rote learning based on examples will not take you very far. I will do Q2:

(-750)(0.05) + (50)(0.95).

Your job is to understand where the numbers have come from (and to do the arithmetic).