The probability distribution of a random variable X is given below:(i)

1.	The probability distribution of a random variable X is given below:(i) Determine the value of k.(ii) Determine P (X ≤ 2) and P (X > 2)(iii) Find P (X ≤ 2) + P (X > 2).
Answer» (i) W.k.t P(0) + P(1) + P(2) + P(3) = 1 ⇒ k + k/2 + k/4 + k/8 = 1 (8k + 4k + 2k + k)/8 = 1 15k = 8 Hence, k = 8/15 (ii) P(X ≤ 2) = P(X = 0) + P(X = 1) + P(X = 2) = k + k/2 + k/4 = 7k/4 = 7/4 x 8/15 = 14/15 And P(X > 2) = P(X = 3) = k/8 = 1/8 x 8/15 = 1/15 (iii) P(X ≤ 2) + P(X ≥ 2) = 14/15 + 1/15 = (14 + 1)/15 = 15/15 = 1

The probability distribution of a random variable X is given below:(i) Determine the value of k.(ii) Determine P (X ≤ 2) and P (X > 2)(iii) Find P (X ≤ 2) + P (X > 2).

Answer»

(i) W.k.t P(0) + P(1) + P(2) + P(3) = 1

⇒ k + k/2 + k/4 + k/8 = 1

(8k + 4k + 2k + k)/8 = 1

15k = 8

Hence, k = 8/15

(ii) P(X ≤ 2) = P(X = 0) + P(X = 1) + P(X = 2)

= k + k/2 + k/4 = 7k/4 = 7/4 x 8/15 = 14/15

And P(X > 2) = P(X = 3) = k/8 = 1/8 x 8/15 = 1/15

(iii) P(X ≤ 2) + P(X ≥ 2) = 14/15 + 1/15 = (14 + 1)/15 = 15/15 = 1

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The probability distribution of a random variable X is given below:(i) Determine the value of k.(ii) Determine P (X ≤ 2) and P (X &gt; 2)(iii) Find P (X ≤ 2) + P (X &gt; 2).

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The probability distribution of a random variable X is given below:(i) Determine the value of k.(ii) Determine P (X ≤ 2) and P (X > 2)(iii) Find P (X ≤ 2) + P (X > 2).