Here is the table:
Test Result | Actually used? | ||
Yes | No | Total | |
Positive | 124 | 24 | 148 |
Negative | 4 | 155 | 159 |
Total | 128 | 179 | 307 |
We have to find the probability that
P(tested negative or did not use marijuana)
= P(tested negative) + P(did not use marijuana) - P(tested negative and did not use marijuana)
Hence the required probability is 0.596
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