There are 6 marbles in a bag: 1 blue, 1 red, 1 white, 1 yellow, 1 green, and 1 black. Mary picks one marble at random and then h
2 answers:
The probability that Mary picks the red marble and her sister picks the blue marble is .
- Firstly, we need to find the probability of Mary picking a red marble from the 6 marbles.
- Secondly. we need to find the probability of Mary's sister picking a blue marble from the 5 left marbles.
- As both are mutually exclusive events , the required probability is the multiplication of both above.
- P(A) = Mary picking a red marble out of 6 marbles =
- P(B) = Mary's sister picking a blue marble out 5 left marbles =
- P(E) = Required probability = P(A) × P(B) =
×
=
Thus, the probability that Mary picks the red marble and her sister picks the blue marble is .
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Answer:
Step-by-step explanation:
Assuming the maximum score for the final is , we can multiply each score by its respective course weight and add them together to give a final score. If your friend did receive this maximum score of
, their overall grade for the course would be:
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To find the minimum score they need to earn a 75% for the course, we set up the following equation:
, where
is the minimum score she needs.
Solving, we get:
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