Question
The probability distribution of X is :
| X | 0 | 1 | 2 | 3 |
|---|---|---|---|---|
| P(X) | ${{1 - d} \over 4}$ | ${{1 + 2d} \over 4}$ | ${{1 - 4d} \over 4}$ | ${{1 + 3d} \over 4}$ |
For the minimum possible value of d, sixty times the mean of X is equal to _______________.
Correct Answer
75