2011年11月IB数学SL真题下载-Paper1

2011年11月IB数学SL真题下载-Paper1

1.Let f be a quadratic function. Part of the graph of f is shown below.

The vertex is at P(4, 2) and the y-intercept is at Q(0, 6) .

(a) Write down the equation of the axis of symmetry. [1 mark]

The function f can be written in the form f (x) = a (x − h)2 + k .

(b) Write down the value of h and of k . [2 marks]

(c) Find a .

 

2.

3.A box contains six red marbles and two blue marbles. Anna selects a marble from the box. She replaces the marble and then selects a second marble.

(a) Write down the probability that the first marble Anna selects is red. [1 mark]

(b) Find the probability that Anna selects two red marbles. [2 marks]

(c) Find the probability that one marble is red and one marble is blue.

 

4.Let f '(x) = 3x2 + 2 . Given that f (2) = 5 , find f (x) .

 

5.The random variable X has the following probability distribution.

Given that E(X ) =1.7 , find q .

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