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Probability is a measure of the likelihood or chance that a specific event will occur. It is expressed as a number between 0 and 1, where 0 indicates impossibility, 1 indicates certainty, and values between 0 and 1 represent the degree of likelihood. In mathematical terms, if P(A) represents the probability of event A, then:
The probability of a possible event is determined based on various factors, observations, or information available. There are different approaches to calculating probability:
Understanding the context of the problem is crucial for choosing the appropriate method to calculate probability. Probability theory is widely used in various fields such as statistics, finance, physics, and machine learning to make informed predictions and decisions based on uncertain information.
1. Given a coin which gives HEADS with probability 1/4 and TAILS with 3/4. The coin is tossed k times. What is the probability that we get at least k/2 HEADS is less thann or equal to?
2. Out of all the 2-digit integers between 1 and 100, a 2-digit number has to be selected at random. What is the probability that the selected number is not divisible by 7?
3. If the difference between expectation of the square of a random variable (E[X²]) and the square of the expectation of the random variable (E[X])² is denoted by R, then?