11．If a random variable X has a mean of 5 and a standard deviation of 4, and Y = 3X-2,find the .

(2 marks)

10. If X is a random variable with probability density function,

Find the Pr to 3 decimal place.

(2 marks)

9. Which of the following graphs represents Pr(), where the random variable X has

the probability distribution function below?

(2 marks)

8. If a random variable X has a probability density function

find the mode of X .

(2 marks)

7. If a random variable X has a probability density function

find the median of X to 3 decimal place.

(2 marks)

6. If a random variable X has a probability density function,

find the variance of X to 3 decimal place.

(2 marks)

5. If a random variable X has probability density function,find 　to 3 decimal place.

(2 marks)

4. If a random variable X has probability density function,

a.Find 　to 3 decimal place.

(2 marks)

b.Find the E(X).

(2 marks)

2.If the function f(x) = 2x represents a probability density function, then find the

Max domain of f。

(2 marks)

3 If a random variable X has probability density function，find the value of k.

(2 marks)

1．Which of the following graphs could not represent a probability density function?

(1 mark)