Respuesta :
Answer:
Step-by-step explanation:
probability of choosing a boy = 12 / 28 = 3 / 7
in % = 3 / 7 x 100 = 42,86%
probability of choosing an a student = (4 + 10) / 28 = 14 / 28 = 1 / 2
in % = 1 / 2 x 100 = 50%
The probability of choosing a boy is 0.4 and the probability of choosing a student with 'A' grade is 0.5.
We have a science class of twenty-eight students with 12 boys and girls. In a unit test, 4 boys and 10 girls made an A grade. Then, a student is chosen at random from the class.
We have to find the probability of choosing a boy or an A student.
What is the formula to calculate the probability of an event ?
The formula to calculate the probability of an event is -
[tex]P(A) = \frac{number of possible outcomes}{Total number of possible outcomes}[/tex]
In the question, we have to -
1 - We have to find the probability of choosing of a boy.
Let the event of choosing a boy be Event 'A'. Then the probability of event 'A' is -
P(A) = [tex]\frac{12}{28}[/tex] = 0.4
2 - We have to find the probability of a student who scored 'A' -
Total number of students who scored 'A' grade is = (10 + 4) = 14
Let this event of choosing a student with 'A' grade be Event 'B'. Then the probability of event B is -
P(B) = [tex]\frac{14}{28}[/tex] = 0.5
Hence, the probability of choosing a boy is 0.4 and the probability of choosing a student with 'A' grade is 0.5.
To solve more questions on probability, visit the link below -
brainly.com/question/743546
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