Tag | Value |
---|---|
file | Probability_uva-expected-value-763-en_uva-expected-value-763-en |
name | uva-expected-value-763-en |
section | Probability/Elementary Probability/Random variables/Expected value |
type | num |
solution | 1.2 |
tolerance | 0 |
Type | Calculation |
Language | English |
Level | Statistical Literacy |
IRT-Difficulty | 5.144 |
p-value | 0.0088 |
A closed box contains five balls: three red and two yellow. You pick two balls at the same time at random. Suppose the random variable X is the number of red balls and X can take the values 0,1 and 2. What then is the expectation value of X?
The correct answer is: 1.2