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  • Please Solve R.D. Sharma class 12 Chapter 30 Probability Exercise Multiple Choice Questions Question 5 Maths Textbook Solution.

Please Solve R.D. Sharma class 12 Chapter 30 Probability  Exercise Multiple Choice Questions Question 5 Maths Textbook Solution.

Answers (1)

Answer: (a)

Hint: You must know the rules of finding probability.

Given:

P (India getting 1 point) = 0.45

P(India getting 2 point) = 0.05

P(India getting 3 point) = 0.50

Solution:Here there are total five ways by which India at least get 7 points.

\begin{aligned} &1^{\text {st }} \text { way }=2 \text { points }+2 p+2 p+2 p=(0.5 \times 0.5 \times 0.5 \times 0.5) \\\\ &2^{\text {nd }} \text { way }=1 p+2 p+2 p+2 p=(0.05 \times 0.5 \times 0.5 \times 0.5) \\\\ &3^{\text {rd }} \text { way }=2 p+1 p+2 p+2 p=(0.5 \times 0.05 \times 0.5 \times 0.5) \\ \end{aligned}

\begin{aligned} &4^{\text {th }} \text { way }=2 p+2 p+1 p+2 p=(0.5 \times 0.5 \times 0.05 \times 0.5) \\\\ &5^{\text {th }} \text { way }=2 p+2 p+2 p+1 p=(0.5 \times 0.5 \times 0.5 \times 0.05) \end{aligned}

\begin{aligned} &P \text { (at least 7 points) }=(0.5 \times 0.5 \times 0.5 \times 0.5)+4(0.05 \times 0.5 \times 0.5 \times 0.5) \\\\ &=0.0625+4(0.00625) \\\\ &=0.0625+0.025 \\\\ &=0.0875 \end{aligned}

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