# Question

1. Expression for the variance of Y

2. Probability that the first trial B1 fails.

3. Expression for the mean of X

4. Probability that Y is zero

5. Probability that X is 2

6. Covariance between B1 and B2

7. Expression for the expected value of Y

8. The expected value of B1

9. Probability that Y is n

10. Probability that X is zero

(a) np

(b) e-λ

(c) e-λ λ2 / 2

(d) p

(e) 0

(f) pn

(g) 1 - p

(h) (1 – p)n

(i) np(1 – p)

(j) λ

2. Probability that the first trial B1 fails.

3. Expression for the mean of X

4. Probability that Y is zero

5. Probability that X is 2

6. Covariance between B1 and B2

7. Expression for the expected value of Y

8. The expected value of B1

9. Probability that Y is n

10. Probability that X is zero

(a) np

(b) e-λ

(c) e-λ λ2 / 2

(d) p

(e) 0

(f) pn

(g) 1 - p

(h) (1 – p)n

(i) np(1 – p)

(j) λ

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