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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
An area of a normal probability distribution represents?
The number 1. The area of any probability distribution equals 1.
A coin is tossed twice what is the probability that it will show heads both times?
The probability is 0.25.
Look at it this way--if you toss a coin twice, there are four equally-probable outcomes:
- tails, tails
- tails, heads
- heads, tails
- heads, heads
So the probability of heads twice in a row is one in four, or 25%.
the chance of tossing heads is 1/2 (50%) The chance of tossing the next heads is 1/2 (50%) 1/2 x 1/2 = 1/4 (25%)
It is 6/36 = 1/6.
There are 8 out of 20 numbers that are prime, so 8/20, or 2/5.
Given the mean of 259 and a standard deviation of 229.1 what is the z-score of the value 78?
(78-259)/229.1= -.79
Probability of two coins landing on tails?
the probabiluty of two coins landing on tails is 1/2 x 1/2 = 1/4, or one chance in four
What is approximate probability that a human offspring will be female?
50%, or half. Therefore, there is an equal chance that the offspring will be female.
Distribution would be centered at .14*128=17.92
The standard deviation of the distribution would be root(n(p(p-1)))=root(128*.14*.86)=3.92571013
Normal, unimodal
5 red candies 3 blue candies 4 yellow candies What is the probability of getting a red candy?
5 over 12
.0504
How do you make a marble sorter hopper release one marble at a time?
Carefully assemble the box of marbles to the box of marbles to the box of human fecies
Why might experimental probability be different from theoretical probability?
There may not have been a sufficient number of experiments carried out.
The experiments may not have been carried out properly.
There may have been incorrect assumptions made in deriving the theoretical probability.
If you roll a die 60 times what is the probability you will roll a one or a six?
I'm assuming you're looking for the probability that you roll either a one or six at least once. So the problem can be rewritten as:
1 - probability of rolling 60 times and never getting ones or sixes
= 1 - (2/3)^60
How many ways can 9 books be arranged on a shelf so that 5 of the books are always together?
You can simplify the problem by considering it as two different problems. The first involves consider the five-book chunk as a single book, and calculating the permutations there. The second involves the permutations of the books within the five-book block. Multiplying these together gives you the total permutations.
Permutations of five objects is 5!, five gives 5!, so the total permutations are:
5!5! = 5*5*4*4*3*3*2*2 = 263252 = 14,400 permutations
Are mutually exclusive events independent?
Not necessarily. In fact, in binary situations they can be totally dependent - depends on the experiment.
If you flip a coin 5 times what is the probability it comes up heads on the 3rd flip?
The probability of 'heads' on any flip is 50% .
2 ?
Is it unusual to get a 12 when a pair of dice is rolled?
no it is not unusual to get a 12 as it is impossible to know what you will get as. it is based on a number of factors like the size of die or speed of throwing etc. so it is not unusual to get a 12
What is the probability of getting a 2 or 12 on two dice?
The probability of getting a 2 or 12 on two dice is 2 in 36, or 1 in 18.
The first position can be filled by eight, the second by seven, and so on. So the number of possibilities are:
8!/3! = 8*7*6*5*4 = 6720
