Probability

Approximately 2 standard deviations (1.96, actually) from the mean. That is important to know that if one has a sample of 1000 values, if one selects a threshold at +/- 2 standard deviations from the mean, then one expects to see about 25 values exceeding those thresholds (on each side of the mean)

Each time you toss the die the probability of rolling an even number is 3 out of 6 or 1/2. So, the probability of tossing three consecutive even numbers is (1/2)3 = 1/8 = 0.125, which is one chance in eight.

http://answerboard.cramster.com/statistics-and-probability-topic-5-292446-0.aspx

If two events are disjoint, they cannot occur at the same time. For example, if you flip a coin, you cannot get heads AND tails. Since A and B are disjoint, P(A and B) = 0

If A and B were independent, then P(A and B) = 0.4*0.5=0.2. For example, the chances you throw a dice and it lands on 1 AND the chances you flip a coin and it land on heads. These events are independent...the outcome of one event does not affect the outcome of the other.

Weather forecasts, engineering, sales and advertising, etc. It is used very often when risk or potential volume must be determined, such as in size of streets for future development, or buying and selling of goods. Probability also has a large role in quantum physics.

(29/78)*(28/77)*(27/76)*(26/75)*(25/74) = .0056252425

two events are dependent if the outcome of one event affects the probability of the other events. The probability that dependent events A and B occur together is

P(A and B) = P(A) * P(B given A)

secretaries......4

technicians...20

engineers...... 4

executives......2

workers........50

==========

Total............80

Probability to select a factory worker = 50/80 or 5/8

in the equation system f/d = p where f is the number of sides of the rolled polyhedron which contain a number of spots that can be represented by a positive integer not divisible by 2 and d represents the total number of faces of the polyhedron which can, in the rest position, face upward, the variable p represents the probability of rolling an odd number. from this it can also be derived that the probability p of rolling an even number can be represented by (d-f)/d.

Since it can only rotate two directions, the chance is 50%. There are rotation indicators you can buy to check the phase sequence.

If you have primary school age children then the likelihood of them getting head lice (repeatedly!( these days is very high - believe me! Chances are you will have them too at some point. Other than that, I would think your chances of catching them are quite low.

To stop yourself being scared the best thing to do is to realise that it happens to lots of normal people, and to lots of normal people's children. You get a more realistic picture when you realise that - it is not a major catastrophe, nor something that can't be fixed. They can even be eradicated naturally - it just takes patient combing with a fine tooth comb - for a few weeks to ensure none are left.

One way to keep them away, there is home remedy.. it conset of rosemary poppuri a lil of olive oil, (because you don't want to dry out the sclap with the poppuri) so u mix it all up! apply around the edges of the hair. where lice tend to enter.. for sum reason the lice don't like it... so there u have it good luck.. if this works for u let me no!! muah...

Why be scared lol it happens you just need to get the right stuff to put on your hair.... and...... bobs your uncle!!!!! well he's my dad but you get my point

9 times 9 times 9 times 9 times 9 times 9 times 9 times 9 times 9 =

Imagine it's a combination lock with 9 tumblers. Each tumbler has 9 "positions" - the digits from 1 to 9. So you multiply the number of digits [9] against itself [9] for as many tumblers are in the combination (9).

Tumbler # 1 2 3 4 5 6 7 8 9

Number of

possible

digits 9 9 9 9 9 9 9 9 9

sam. theorm

I'm not sure on the actual percentages. It firstly depends on if your father is an identical or non-identical twin. (Maternal or fraternal) Non-identical (fraternal) twins are the hereditary type, not the identical ones. Identical twins are simply a hiccup with the cell division during fetal growth, whereas non-identical twins are due to the hereditary tendency of the woman releasing more than one egg at a time. The gene for non-identical twins is directly passed from fathers to daughters, and the chance of having twins usually skips a generation too (like baldness in men!). So, if your father is a twin (a non-identical twin) and you are his daughter, it's possible that you may also have twins, but it's far more likely that your daughter will. My father is a twin (his brother died at birth and it's not known if he was maternal or fraternal unfortunately) and I only have 1 child (a daughter). She has a very high chance of having twins if dad was fraternal.

1 and 2 are the only two numbers less than 3 so the odds of rolling a number less than 3 is 2/6 or 1/3. Now the odds of heads is 1/2. We use the multiplication rule and we have

1/2x 1/3=1/6 so the odd are 1 in 6

With 4 coins you have 24 (16) possibilities. If we wanted a specific coin to land 'tails' while the others landed 'heads' we would have one possibilty out of 16. Since we don't care which of the coins lands 'tails,' we have four chances in 16 or a 25 percent chance.

• The orbit of a satellite, planet, moon, or comet.
• The interaction of a charged particle in the vicinity of the nucleus of an atom.
• The trajectory of a baseball, bullet, or missile.
• The dropping of a rock from a bridge.
• Skydiving. (At least, up to terminal velocity.)
• etc., etc., etc.

3/5 or .6

erm..one in 52?? 1 in 52

0.3456

1 out of 20

this is because there are 20 numbers in total, and there is only one 7 in there. (Assuming that there is the same probability for each number to be chosen, and that 17 is excluded as an affirmative outcome)

You can never be sure. The more often you toss it the closer the probability gets to a 50-50 split but there is no guarantee.

Wiki Answers is not a homework service

Using a tree diagram to solve this is using a sledge-hammer to crack a nut. the answer is (26/52 )(25/51)(24/50) or 6/51 = 2 / 17

There are eight possible results when flipping three coins (eliminating the highly unlikely scenario of one or more coins landing on their edge): Dime - Heads / Nickel - Heads / Penny - Heads Dime - Heads / Nickel - Heads / Penny - Tails Dime - Heads / Nickel - Tails / Penny - Heads Dime - Heads / Nickel - Tails / Penny - Tails Dime - Tails / Nickel - Heads / Penny - Heads Dime - Tails / Nickel - Heads / Penny - Tails Dime - Tails / Nickel - Tails / Penny - Heads Dime - Tails / Nickel - Tails / Penny - Tails