Expected Value
The expected value E(X) of a random variable X is also called
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More statistics and probability Practice Questions
A group of ten numbers has a recorded mean of fifteen, but later one entry originally read as eight ...
A group of ten numbers has a recorded mean of fifteen, but later one entry originally read as eight ...
A binomial random variable representing successes in n trials has mean equal to 4 and variance equal...
A binomial random variable representing successes in n trials has mean equal to 4 and variance equal...
From a committee containing seven men and five women, a subcommittee of three persons is selected at...
From a committee containing seven men and five women, a subcommittee of three persons is selected at...
An urn holds four red and six blue balls, and one ball drawn at the first stage is set aside without...
An urn holds four red and six blue balls, and one ball drawn at the first stage is set aside without...
Two friends agree to meet between five and six o'clock, each arriving at a uniformly random time and...
Two friends agree to meet between five and six o'clock, each arriving at a uniformly random time and...
When every observation in a dataset is first multiplied by three and then increased by five, how doe...
When every observation in a dataset is first multiplied by three and then increased by five, how doe...
Suppose events A and B satisfy P(A) = 1/2, P(B) = 1/3, and the conditional probability P(A given B) ...
Suppose events A and B satisfy P(A) = 1/2, P(B) = 1/3, and the conditional probability P(A given B) ...
A diagnostic test detects a disease present in one percent of a population with sensitivity ninety-n...
A diagnostic test detects a disease present in one percent of a population with sensitivity ninety-n...
In a binomial setting where a marksman hits a target with probability 1/4 on each independent shot, ...
In a binomial setting where a marksman hits a target with probability 1/4 on each independent shot, ...
Two distinct groups contain twenty and thirty students with mean marks of sixty and seventy respecti...
Two distinct groups contain twenty and thirty students with mean marks of sixty and seventy respecti...
Two players alternately roll a fair die starting with the first player, and whoever first rolls a si...
Two players alternately roll a fair die starting with the first player, and whoever first rolls a si...
A fair six-faced die is rolled once and the random variable X equals the number shown on the top fac...
A fair six-faced die is rolled once and the random variable X equals the number shown on the top fac...
About This Question
- Subject
- mathematics
- Chapter
- statistics and probability
- Topic
- expected value
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Mean
- Mathematical Def: E(X)=∑xiP(X=xi).
- Concept: It represents the long-run average value of repetitions of the same experiment.
- Terminology: In the context of probability, 'Expected Value' and 'Mean' are used interchangeably to describe the first moment about the origin.
This easy difficulty mathematics question is from the chapter statistics and probability, covering the topic of expected value. It appeared in the 2025 exam.
Looking for more practice? Explore all mathematics questions or browse statistics and probability questions on RankGuru.