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Probability

The probability of a certain event is a number expressing the likelihood that a specific event will occur, expressed as the ratio of the number of actual occurrences to the number of possible occurrences. In mathematics, it is a measure of how often an event will happen and is the basis of statistics.

14,643 Questions

If a small marble is dropped straight downward what is the initial velocity of the marble?

The initial velocity is zero.

In most basic physics problems like this one the initial velocity will be zero

as a rule of thumb:

the initial velocity is always zero, unless otherwise stated, or this is what you are solving for

Cases where the initial velocity is not zero

examples

a cannon ball is shot out of a cannon at 50 mph

a ball is thrown from at a speed of 15 mph

etc

How do you Draw a flowchart to display the highest of any 10 numbers entered?

The basic idea is as follows. Assume an array n(), of ten elements.* Set variable "highest" to the first number, n(1).

* Set index "i" equal to 2.

* Do the following in a loop:

* If n(i) is greater than "highest", replace "highest" with n(i).

* Increment i by 1.

* Compare whether "i" is greater than 10. If it is, leave the loop.

* Display variable "highest".

What is the probability distribution that can be describe by just one parameter?

There are probably many probability distributions that have just one parameter. The most important one for statistical analysis is probably the Student t distribution.

This probability distribution is fully described by a single parameter which is often called "degrees of freedom". The parameter describes the scale of the distribution, and not the location, since the Student t distribution is always centered at zero (unlike the normal distribution, which has a scale parameter, the variance, and a location parameter, the mean).

Another example of a distribution that is described with a single parameter is the exponential distribution. Unlike the Student t distribution, it is a distribution that takes only positive values.

Using a well-shuffled deck of normal playing cards what is the probability of randomly selecting a black 8?

There are four 8's, four 7's, four 6's, four 5's, four 4's, four 3's, four 2's, and four aces. Add all of them up and you get a total of 32 cards so the probability is 32/52 which reduces to 16/26 which reduces to 8/13= Probability of the above mentioned outcome.

Could someone help me with this math problem?

Hello guys! This is the problem:

In ∆BRO, ∠R is a right angle and the remaining angles are congruent. Find the m∠B and m∠O. Note that the sum of all the angles in a triangle is 180°

You are 6 months pregnant with your abusive boyfriend's twin boys these will be your first children together you both have no outside children should you stay with him?

Not if he is abusive...physically, mentally, or emotionally. Those boys will eventually get the same treatment from him as you do, he can be the father...but that doesn't mean you can't raise them without him. Get out of that relationship before you or your unborn children are hurt. And if you can't see yourself without him...at least try. It never hurts to try, especially if he is already hurting you.

If you think you are a narcissist but you truly love others and feel suicidal at the thought of being one does this rule you out as one and can you train your mind into thinking another way?

PLEASE DO NOT HURT YOURSELF. I am not a professional mental health care provider, but I have personal experience with a true narcissist. I believe that if YOU understand your selfishness and egotism, and feel the need to change, you certainly cannot be a narcissist. A narcissit, in my humble opinion, is pathological. This pathology or mental disorder is what they have become. They feel they are normal. They think everyone else is not, and is the people and things in their lives are merely an extension of his or her wants and needs. A narcissist cannnot feel empathy, meaning they cannot feel the pain they inflict upon others. They will use and discard people, places and things when these things no longer provide the flow of approval and acceptance they need. They also do not see the world as we see it. Non-narcissists see the world as something to help them grow...they appreciate people and loved ones and grow from their mature interactions accordingly. A narcissist has two selves they unconsciously deal with inside, they are in constant turmoil. They do not realize this, but see assume their psyche and daily function as being normal. It is a battle between two selves. The true self is buried beneath the false self. The true self is unhappy, lacking in self-confidence, feels unloved, unappreciated (these traits are believed to come from early childhood abuse/neglect/spoiling)...from these feelings come also negativism, fear, anxiety, etc., even hatred, jealousy, rage and bitter anger The false self is what is projected to you, that self is every good personality trait they want you to believe they have. This is their supreme mimic of normal behavior, and although sometimes eccentric and forced, they have learned that this behavior will get them what they want. This is the person we non-narcissists care for, until the true self raises it's ugly head and then we see the selfish, egocentric behavior, the "world revolves around me and my needs" type of behavior and attitude that truly exists below the surface. And it will raise it's head, those of us who also have needs and desires will express them, and to the narcissist, this is taboo. They expect us to revolve around them and continually infuse them with the power of adoration, passionate love, blind faith...until we realize that they will never change, we will be cause in an endless cycle where we become nothing but a shell because we have nothing more to give, and have never received anything in return. Certainly if you are so depressed because you see your behavior as non-acceptable and you realize what you have done in the past or present, this is a good thing... true narcissists are beyond help because they see themselves as right and normal. They know no other way to think and/or if they do realize, they won't exert the strength to mend their ways because it is easier to be what they are than to realize and change. Y the fact that you DO realize...you should be thankful for this, PLEASE...not suicidal! Please do not see this as a reason to hurt yourself. Each adult reaches a point in their lives where they look back and realize how self-absorbed they have been. Your growth has been a process of self-realization. We look back with dismay because of the way we have treated people and lived our lives. Make amends. It is a simple as that. A sincere apology for hurting, for leaving things undone, and the sincere quest for the humility needed to keep growing as an adult will mend you...have faith in someone or something and start each day with a pledge to be the best person you can be. This starts with caring more about others than yourself. Please get professional mental health care, or talk with your pastor or someone who you respect. Your life is just beginning and it will get better! God Bless. mbme ANOTHER ANSWER Like the first poster, I am not a mental health professional but have dealt with a number of Narcissists and people with strong N traits. Your concern that you may be one is strong evidence that you are NOT. People who live in Narcissistic behaviors do not care about other people except as it impacts themselves. They are totally selfish, egocentric, exploitative, and eventually very cruel. I mean VERY cruel, discarding those who have been trapped by them in very cold demeaning ways. If you have empathy for others or are concerned that you may have been hurtful to someone, you are acknowledging behavior you want to change. People who have strong N traits have no intention of changing--only hiding for a while until they get you where they want you. Then they can inflict their ultimate dumping cruelty on you. Seek help from a counsellor who is qualified to deal with your issues. Be healed and live a long happy life. Georgette

How do you to remove old exhaust bolts when they are rusted?

Penetrating fluid removes stuck boltsBolts that are heated like in the exhaust manifold/catalytic converter/muffler are easy to break. Spray bolts with penetrating lubricant like PB Blaster, Liquid Wrench, or WD40. Spray and let soak for several times a day for about three days. Really stuck bolts may need to be tapped with a hammer to try to get the penetrating fluid to get into the threads.

WD40 IS A LUBRICANT - it will NOT break up rust.

In a word aspiration what is the probability for selecting one letter as vowel?

There are 10 letters in the word "aspiration" and 5 of them are vowels. The probability of a randomly-selected letter being a vowel are 5/10 = 1/2 = 0.50.

What are the applications of mathematics in engineering field?

Math allows you to calculate load, forces, stability, fragility, stress, strain, it goes on for ever.

Distinguish between mean deviation and standard deviation?

The mean deviation for any distribution is always 0 and so conveys no information whatsoever.

The standard deviation is the square root of the variance. The variance of a set of values is the sum of the probability of each value multiplied by the square of its difference from the mean for the set.

A simpler way to calculate the variance is

Expected value of squares - Square of Expected value.

In a standard deck of cards how many are diamonds or 4s?

There are 13 diamonds, and 4 number 4's. One card is both a diamond and a 4. Total, 16 are diamonds or 4's.

If you alternate between flipping a coin and rolling a die what is the probability of rolling a 2 before flipping a heads?

The probability of rolling a 2 on a die before flipping a heads on a coin is 1 in 12.

The probability of rolling a 2 is 1 in 6. The probability of flipping heads is 1 in 2. Since these are sequentially unrelated events, you simply multiply the probabilities together.

When we use f distribution?

When comparing the sums of squares of normal variates.

Rolling an even number from two dice?

The two dice can be (odd, odd), (odd, even), (even, odd), or (even, even). Thus the probability of two dice totaling an even number is 2*(1/2)*(1/2) = 1/2.

50/50

What is the probability of rolling a number greater than 4 On a dice?

The probability for dice depends on how many. For a die, it is 1/3.

What event is represented by the 1?

A certainty.

A certainty.

A certainty.

A certainty.

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