Johnny Said:

Probability Math Problem HOMEWORK HELP PLEASE!!!?

We Answered:

Need to find probability that John will practice his piano lesson. That is to find propability of John practicing regardless of weather condition.

Let probability that John will practice his piano lesson if it rains expressed as P(J / R) = 0.8
Let probability that John will practice his piano lesson if it does not rain expressed as P(J / NR) = 0.4
Let probability that it rains expressed as P(R) = 0.6 = 60%

This is what we call a conditional probability problem;

Applyig the formulas of conditional propability we have;

P(J / R) = P (J and R) / P(R)
0.8 = P (J and R) / 0.6
P (J and R) = 0.6 * 0.8 = 0.48 [Probability John practicing and it is raining]

P(J / NR) = P (J and NR) / P(NR)
0.4 = P (J and NR) / (1 - 0.6) = P (J and NR) / 0.4
P (J and NR) = 0.4 * 0.4 = 0.16 [Probability John practicing and it is not raining]

Hence;
Propability of John practicing regardless of weather condition is

P(John Practicing) = 0.48 + 0.16 = 0.64

Virgil Said:

Can someone help with a math question?

We Answered:

To solve this problem, calculate the probability that no answers are correct, which is (0.8)**20. Subtract that number from 1.0 ro get the probability of 1 or more correct.

Curtis Said:

GCSE maths probability hardest question help please.?

We Answered:

when the events are independent,

P(A) * P(B) = P(A and B)
0.2 * 0.14 = 0.028
As 0.028 is not 0.3, the probabilities are different, and therefore they are not independent.

Justin Said:

math help - probability in rolling dice?

We Answered:

I may be wrong, but I believe you have it right until the end I think it is 1/36, because if you thought about the number possibilities of 2-12 you can only get 12 one way and that is 6 and 6 so there fore it would be the number of possibilities on one dice times the number of possibilities on the other to give you a 1 and 36 chance of hitting double 6's. If it was 2/36 there would have to be a second way to get double 6's right?

Jonathan Said:

What is a good video with a math connection for 5th and 6th graders?

We Answered:

Hard question if your time is limited...

The Economics of Staying in School.... Human Resources and Development Canada. The presentation and video is geared towards older kids, but is well done and applicable in any middle years classroom.

Idea... you can use any type of video... even a cartoon, and have the students count a particular word or action. Have different groups of students look for different words/actions. Then use these to work their knowledge of algorithms. (I realize that this is not what you are asking for, but a sub should be able to handle it).

Check with your librarian... there are lists and lists of good videos that you can access for free. Manitoba Education has loads of them. Career education areas tend to spotlight careers using math, science, and technology.

If you use problem solving as a focus in your class, maybe a movie on chess... Bobby Fischer, etc.

Oh... Bill Nye is always a good choice...

Regina Said:

How do I work this math (probability) problem?

We Answered:

sample space=896
favourable event=409
probability=409/896

Enrique Said:

Math Homework Help: Probability?

We Answered:

assuming school meets 5 days a week:

1) event - PE lesson: 5 times every 15 days, 5/15, .333, 33/3%
2) homework from Indonesian teacher: 2 times every 5 days, 2/5, .40, 40%
3) lab period: 9 times every 30 days, 9/30, .30, 30% (note - if the question says how many periods per school day there are, the answers different)
4) using calculators: 3 of 11 problems, 3/11, .2727, 27.27%