The probability that two different friend have different birthdays (ignoring a leap year) is : a) 364/365 .
What is the best probability that two people will have the same birthday?
One person has a 1/365 chance of meeting someone with the same birthday. Two people have a 1/183 chance of meeting someone with the same birthday.
What is the probability that two friends will have the same birthday?
What’s the chance that two people share the same birthday? The first person can be born on any day of the year, this means that the probability is 365/365 = 1 . The second person has to be born on the same day as the first and there is a 1/365 chance of that happening.
What is the probability that two people have a birthday on the same day of the same month answer?
Since Person B must be born on the same day as Person A their probability is 1/365 . We want both of these events to happen so multiply the probabilities: The probability that any randomly chosen 2 people share the same birthdate.
What is the probability that two?
Probability of Two Events Occurring Together: Independent
Just multiply the probability of the first event by the second . For example, if the probability of event A is 2/9 and the probability of event B is 3/9 then the probability of both events happening at the same time is (2/9)*(3/9) = 6/81 = 2/27.
When two dice are thrown what is the probability?
We know that the total number of possible outcomes when two dice are thrown is = 6×6=36 . We know that the probability of any event is the ratio of the number of favourable outcomes and the number of possible outcomes.
What is the rarest birthday?
- February 29.
- July 5.
- May 26.
- December 31.
- April 13.
- December 23.
- April 1.
- November 28.
Is it good to date someone with the same birthday?
Statistically speaking, with 365 days in a year, there’s a . 27 percent chance of any two people sharing the same calendar date as birthdays . And those odds mean that it’s possible – improbable but not impossible – for those two people to have a connection and marry.
What is the most common birthday?
According to real birth data compiled from 20 years of American births, mid-September is the most birthday-packed time of the year, with September 9th being the most popular day to be born in America, followed closely by September 19th.
How many people must be there in a room to make the probability 100% that at-least two people in the room have same birthday? Answer: 367 (since there are 366 possible birthdays, including February 29).
Is the birthday paradox true?
Actual birth records show that different numbers of people are born on different days. In this case, it can be shown that the number of people required to reach the 50% threshold is 23 or fewer. The birthday problem is a veridical paradox: a proposition that at first appears counterintuitive, but is in fact true .
What do you call a person who has the same birthday but in a different year?
Birthday twins . I have no citation, but have often heard this used to describe exactly what is asked: two or more, not necessarily related, born on the same day, regardless of year born. Other forms of the same construction are “astro twins,” “astrology twins,” and “star twins.”
What is the probability at least one?
To find the probability of at least one of something, calculate the probability of none and then subtract that result from 1. That is, P(at least one) = 1 – P(none) .
What is P A and B in probability?
Conditional probability: p(A|B) is the probability of event A occurring , given that event B occurs. ... Joint probability: p(A and B). The probability of event A and event B occurring. It is the probability of the intersection of two or more events. The probability of the intersection of A and B may be written p(A ∩ B).
What is the probability of getting 1 and 5 If a dice is thrown once?
So they are mutually exclusive events, therefore their probabilities add to 1. By symmetry we expect that each face is equally likely to appear and so each has probability = 1/6 . The outcome of a 5 is one of those events and so has probability = 1/6 of appearing.
