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Worksheet: Calculating Standard Deviation and Variance of Discrete Random Variables
Q8:
Let denote a discrete random variable which can take the values . Given that has probability distribution function , find the standard deviation of . Give your answer to 2 decimal places.
Q9:
Let denote a discrete random variable which can take the values . Given that has probability distribution function , find the standard deviation of . Give your answer to 2 decimal places.
Q10:
Let denote a discrete random variable which can take the values . Given that has probability distribution function , find the standard deviation of . Give your answer to 2 decimal places.
Q11:
Let denote a discrete random variable which can take the values . Given that has probability distribution function , find the variance of .
- A
- B
- C0
- D
Q12:
Let denote a discrete random variable which can take the values . Given that has probability distribution function , find the variance of .
- A
- B
- C
- D
Q13:
Let denote a discrete random variable which can take the values 2, 4, and 5. Given that has probability distribution function , find the variance of . If necessary, give your answer to two decimal places.
Q14:
The function in the given table is a probability function of a discrete random variable . Find the variance of . If necessary, give your answer to two decimal places.
| 3 | 5 | 7 | 8 | |
Q15:
The function in the given table is a probability function of a discrete random variable . Find the variance of . If necessary, give your answer to two decimal places.
| 1 | 3 | 5 | 7 | |
Q16:
The function in the given table is a probability function of a discrete random variable . Given that the expected value of is , find the variance of . Give your answer to two decimal places.
| 1 | 2 | 7 | ||
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