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What is the probability that two people selected at random have the same birthday?
Wiki User
∙ 15y ago
1/365 = 0.00274
Wiki User
∙ 15y ago
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Approximately 10 percent of people are left-handed If two people are selected at random what is the probability that both are right handed?
The probability is approx 0.81
Sample selected in such a way that each member of the population has an equal probability of being included?
random sample
If 15 strangers are all in a room what is the probability of them all having the same birthday?
To determine the probability of 15 random people all having the same birthday, consider each person one at a time. (This is for the non leap-year case.)The probability of any person having any birthday is 365 in 365, or 1.The probability of any other person having that same birthday is 1 in 365, or 0.00274.The probability, then, of 15 random people having the same birthday is the product of these probabilities, or 0.0027414 times 1, or 1.34x10-36.Note: This answer assumes also that the distribution of birthdays for a large group of people in uniformly random over the 365 days of the year. That is probably not actually true. There are several non-random points of conception, some of which are spring, Valentine's day, and Christmas, depending of culture and religion. That makes the point of birth, nine months later, also be non-uniform, so that can skew the results.
What is a sample selected in a such a way that each member of the population has an equal probability of being included?
This is called a random sample.
When every Member of a population has the chance of being selected based on probability what type of sampling is this?
Simple random sampling.
Approximately 10 percent of people are left-handed If two people are selected at random what is the probability that both are right handed?
The probability is approx 0.81
What is probability that 2 persons sharing same birth date?
If you assume that birth dates are uniformly distributed over the year (they are not), and you ignore leap years, then the probability of two people selected at random, share a birthday is 1/365.
What is the probability for a student in a dormitory to be selected if 10 percent of the students live in dormitories and a random sample of 100 is selected?
The probability is 10 percent.
What is the probability of you and 2 complete random people sharing a birthday?
Birthdays are not uniformly distributed over the year. Also, if you were born on 29 February, for example, the probability would be much smaller. Ignoring these two factors, the probability is 0.0082
What is the probability the random variable will assume a value between 40 and 60?
It depends on what the random variable is, what its domain is, what its probability distribution function is. The probability that a randomly selected random variable has a value between 40 and 60 is probably quite close to zero.
What is probability that a leap years selected at random will contain 53 Sundays?
probability = 2/7 to be exact, 28/97 (about 28.87%)
What is the probability that 25 people dont share the same birthday?
The probability that 25 random people don't ALL share the same birthday is: 1 - (1/365)**24, or about 0.999999999999999999999999999999999999999999999999999999999999968 However, I suspect you meant to ask "What is the probability that 25 random people all have different birthdays?" That is: 1 * (364/365) * (363/365) * (362/365) * ... * (342/365) * (341/365) = 0.4313 So about 43% of the time nobody will share a birthday, and 57% of the time, two or more people will share a birthday.
Sample selected in such a way that each member of the population has an equal probability of being included?
random sample
How does sampling becomes random?
When each member of the population has the same probability of being selected as a member of the sample.
What is the probability four random people all have a birthday on Sunday?
1/7*1/7*1/7*1/7=.0004?
What is the probability that a group of 6 people selected at random from 7 men and 7 women will have at least 3 women?
Using the hypergeometric distribution, the answer is 2114/3003 = 0.7040
What sample selected in such a way that each member of the population has an equal probability of being included?
It is a simple random sample.
