A random

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Question 1

A random variable X has the following distribution:

x 0 5 10
P(X = x) 0.4 * 0.3

(a). Is X discrete or continuous? [1 mark]

(b) Fill in the gap marked by *. [1 mark]

(c) State the concept on which your answer to part (b) is based. [1 mark]

(d) Calculate the mean and the variance of this distribution. [5 marks]

(e) Calculate P(X < 7) . [2 marks]