Question

известно что стрелок выбивает 10 очков с вероятностью 0,3 а 9 очков с вероятностью 0,5. какова вероятность события А: стрелок выбил не менее 9 очков?

Answer 1

 

$p(10) = \frac{3}{10}\\\\ p(9) = \frac{5}{10}\\\\ p(9 \ or \ 10) = p(9) + p(10) = \frac{5}{10} + \frac{3}{10} = \frac{8}{10} = 0,8$

 

 

Answer 2

Calculation of the Probability of Event A

To calculate the probability of event A, which is the probability that the shooter scores at least 9 points, we need to consider the probabilities of scoring 9 points and 10 points.

Given: - The probability of scoring 10 points is 0.3. - The probability of scoring 9 points is 0.5.

To find the probability of event A, we need to calculate the probability of scoring 9 or 10 points and add them together.

The probability of scoring 9 or 10 points can be calculated as follows:

Probability of scoring 9 or 10 points = Probability of scoring 9 points + Probability of scoring 10 points

Probability of scoring 9 or 10 points = 0.5 + 0.3 = 0.8

Therefore, the probability of event A, which is the probability that the shooter scores at least 9 points, is 0.8.