spring rains. She prunes the third group as well and also sprays them with an antibiotic. Vanessa monitors the trees for five years after the start of the experiment. The table shows the outcomes, or the counts of how long the trees in each group lived. Treatment Outcomes None Pruning Antibiotic Totals 0 to 2 years 41 35 27 103 2 to 4 years 28 44 46 118 More than 4 years 13 22 51 86 Totals 82 101 124 307 Determine the probability that a randomly selected tree from this experiment lived two to four years or was treated with an antibiotic. Give your answer as a decimal, precise to three decimal places
Tonya , a research director, is conducting an experiment to determine the effectiveness of treatment for peach trees against blight. She randomly divides one grove's trees into three groups. One group is the control with no treatment for blight. She prunes the second group to remove the limbs showing blight after the spring rains. She prunes the third group as well and also sprays them with an antibiotic. Vanessa monitors the trees for five years after the start of the experiment. The table shows the outcomes, or the counts of how long the trees in each group lived.
| Treatment | ||||
|---|---|---|---|---|
| Outcomes | None | Pruning | Antibiotic | Totals |
| 0 to 2 years | 41 | 35 | 27 | 103 |
| 2 to 4 years | 28 | 44 | 46 | 118 |
| More than 4 years | 13 | 22 | 51 | 86 |
| Totals | 82 | 101 | 124 | 307 |
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