csat-suneung 2011 Q26 (Probability and Statistics)

csat-suneung · South-Korea · csat__math-science 3 marks Discrete Probability Distributions Probability Distribution Table Completion and Expectation Calculation
The probability mass function of a discrete random variable $X$ is $$\mathrm { P } ( X = x ) = \frac { a x + 2 } { 10 } ( x = - 1,0,1,2 )$$ What is the value of the variance $\mathrm { V } ( 3 X + 2 )$ of the random variable $3 X + 2$? (where $a$ is a constant.) [3 points]
(1) 9
(2) 18
(3) 27
(4) 36
(5) 45 
The probability mass function of a discrete random variable $X$ is
$$\mathrm { P } ( X = x ) = \frac { a x + 2 } { 10 } ( x = - 1,0,1,2 )$$
What is the value of the variance $\mathrm { V } ( 3 X + 2 )$ of the random variable $3 X + 2$? (where $a$ is a constant.) [3 points]\\
(1) 9\\
(2) 18\\
(3) 27\\
(4) 36\\
(5) 45
Paper Questions
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25 Q26 (Calculus) Q26 (Discrete Mathematics) Q26 (Probability and Statistics) Q27 (Calculus) Q27 (Discrete Mathematics) Q27 (Probability and Statistics) Q28 (Calculus) Q28 (Probability and Statistics) Q29 (Calculus) Q29 (Probability and Statistics) Q30 (Calculus) Q30 (Probability and Statistics)