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Of the students in Miss Jones class 8 have blond hair 10 have brown hair 5 have red hair 6 have black hair and 1 has purple hair What is the probability that a student selected at random will?
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∙ 14y ago
There are 30 students total. 10 of them have brown hair. 10/30 equals 1/3. Answer: 1/3
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∙ 14y ago
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There is a bag of marbles 10 are red 15 are purple and 25 are yellow what is the probability of picking a purple marble?
3/10 or 0.3 is the probability of picking a purple marble.
If there were 6 purple socks and 4 orange socks w hat is the probability that he picked 2 purple socks?
1/3
There were 6 purple socks and 4 orange socks in a drawer Zucky picked one sock without looking and then another without looking replacing the first what is the probability that he picked 2 purple?
Probability of picking purple sock first time is 6/10 or 3/5, second time, probability is 5/9. Thus 3/5 * 5/9 = 15/45 which cancels to 1/3
A bag contains 6 purple and 7 white marbles two marbles are drawn at random one marble is drawn and not replaced what is the probability that the fist marble is white and the second is purple?
2/13
A bag contains 2 purple marbles and 6 green marbles - Two marbles are drawn at random - so What is the probability that the first marble drawn is green and the second one is purple?
There are 8 marbles in the bag, and 6 are green, so the chance that the first one you pick is green is 6/8 or .75. Let's call the event where you pick the green marble first, G, for green of course. Now since you picked a marble there are only 7 left. If you picked a green one then the chances of picking a purple one are now 2/7 since there are two purple marbles and seven total marbles. Let's call the event of picking the purple marble F, (I was going to use P but we need that letter for probability. Purple is a fine color so I picked F.) Now we use the conditional probability rule that tells us what is the chance of picking purple given that we already picked green. The symbol P(F|G) means probability of event F given that event G has already happened. P(F|G)= (the probability of picking green and purple)/ (probability of picking green.) We know these from above. G=6/8 and If we pick a green, probability of picking a purple is 2/7 so we multiply these to get probability of picking both and we have 6/8x2/7 or 12/56. So 12/56=(Probability of Picking green and purple)/( probability of picking green). We have 12/56=[P(G and F)]/(6/8) we want P(G and F) so we multiply 12/56x 6/8 and we have 72/448 So the answer is : 72/448 or about .16 (NOTE: this would be a totally different problem if we took out the first marble then put it back. It is important to be sure what is being asked. If you replaced the marble, the problem is much easier. It is simply 6/8 x 2/8 =12/64 or 3/16) Some people have trouble remembering or understanding the conditional probability rule. I will take just a second to explain it in the hopes it will make it easier to use and remember. The multiplication rule says if we have two mutually exclusive events, A and B, the probability of A and B is P(A)xP(B), so if we want event A to occur THEN event B, we have P(A)xP(B|A) which means probability of A multiplied by probability of B given A has already happened. This equal probability of A and B so we have: P(A)xP(B|A)=P(A and B) . Now divide by P(A) and we have: P(B|A)=P(A and B)/P(A). This is the way the rule is usually stated. Note: P(A|B)=P(A and B)/P(B).
There is a bag of marbles 10 are red 15 are purple and 25 are yellow what is the probability of picking a purple marble?
3/10 or 0.3 is the probability of picking a purple marble.
How does the experimental probability of making purple compared with the theoretical probability of making purple?
It is not clear why there should be any probability involved. The process of making purple is well understood and so is deterministic, not probabilistic.It is not clear why there should be any probability involved. The process of making purple is well understood and so is deterministic, not probabilistic.It is not clear why there should be any probability involved. The process of making purple is well understood and so is deterministic, not probabilistic.It is not clear why there should be any probability involved. The process of making purple is well understood and so is deterministic, not probabilistic.
A bag has 7 blue marbles and 8 purple marbles.What is the probability of picking a blue marble then a purple marble without replacing?
7/15 for blue marbles and 8/14 for the purple marbles this is dependent probability
3 purple 2 orange and 5 green what is the probability of drawing the 1st and then the 2nd of purple?
It is 1/15.
If there were 6 purple socks and 4 orange socks w hat is the probability that he picked 2 purple socks?
1/3
A jar contains 22 yellow marbles 26 green marbles 17 red marbles and 20 purple marbles A marble is drawn at random what is the probability of not pulling out a purple marble?
probability of pulling out a purple marble = 20/85probability of NOT pulling out a purple marble = 1 - 20/85 = 65/85 = 13/17
10 of the students in school like the color purple 162 students don't like the color purple how many students are in the school?
Answer172 students are in the school. AnswerYou can't really say 172 exactly. Maybe some students are indifferent to it. AnswerThere are "at least" 172 students are in the school.
There were 6 purple socks and 4 orange socks in a drawer Zucky picked one sock without looking and then another without looking replacing the first what is the probability that he picked 2 purple?
Probability of picking purple sock first time is 6/10 or 3/5, second time, probability is 5/9. Thus 3/5 * 5/9 = 15/45 which cancels to 1/3
What is the probability of obtaining a purple-flowered offspring?
None if the flowers are daffodils! They can only be yellow or white.
What is probabilty?
probability is a math goodie. like two to four. if you have four marbles in a bag and two are red and two are purple then what is the probability? the answer is fifty to fifty or two two four.
There are 10 marbles in a bag 5 are blue 2 are yellow and 3 are purple what is the probability of picking a purple marble?
well blue would b picked 65percent of the time an purple would be 25 and ten percent would be yellow
A bag contains 6 purple and 7 white marbles two marbles are drawn at random one marble is drawn and not replaced what is the probability that the fist marble is white and the second is purple?
2/13
