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L15.2082 - Statistics for Business and Economics (2024/2025)
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A random variable X has a variance of 5.7.
What is the variance of 5.4X-4.9? Round your answer to 2 decimal places.
A random variable X has a variance of 5.8.
What is the variance of 3.7X-4.9? Round your answer to 2 decimal places.
You pay your sales personnel a commission of 50% of the amount they sell over $2000.
X = Sales has mean $5000 and standard deviation $1000.
What are the mean and standard deviation of commission payments?
A random variable X has a variance of 7.6.
What is the variance of 7.3X-5.9? Round your answer to 2 decimal places.
Compute the expected value of the following pmf:
Find the mean and variance for the following distribution:
| x | P(x) |
|---|---|
| 0 | 1/8 |
| 1 | 3/8 |
| 2 | 3/8 |
| 3 | 1/8 |
The function described below is a valid probability mass function.
The following, is a valid PMF:
| x | P(x) |
|---|---|
| 0 | 1/8 |
| 1 | 3/8 |
| 2 | 3/8 |
| 3 | 2/8 |
Consider the histogram depicted below:
Which boxplot depicts the same data as the histogram?
A random experiment gave rise to the two-way contingency table shown.
Events L and R are: