In a game, Jim throws three darts at a board. This is called a 'turn'. The centre of the board is called the bull's-eye. The random variable $$\(X\)$$ is the number of darts in a turn that hit the bull's-eye. The probability distribution of $$\(X\)$$ is given in the following table. It is given that $$\(\mathrm{E}(X)=0.55\)$$. Find the values of $$\(p\)$$ and $$\(q\)$$. .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... .................................................................................................................................................... ....................................................................................................................................................

Mathematics
IGCSE&ALevel
CAIE
Exam No:9709_w21_qp_53 Year:2021 Question No:6(a)

Answer:

\(p+q+0.65=1\)
\(p+2 q+0.15=0.55\)
Solve 2 linear equations
\(p=0.3, \frac{3}{10}, \quad q=0.05, \frac{1}{20}\)

Knowledge points:

5.4.1 draw up a probability distribution table relating to a given situation involving a discrete random variable X, and calculate E(X) and Var(X)

Solution:

Download APP for more features
1. Tons of answers.
2. Smarter Al tools enhance your learning journey.
IOS
Download
Android
Download
Google Play
Download