To develop the seasonal forecasting skill of extreme weathers, a study disclosed a relationship between the number of typhoons and the sea surface temperature (SST) in a specific region. In the study, the number of typhoons is grouped into low, median or high levels, and the SST can be categorized into three phases, above normal, normal and below normal. Using the historical records, the study found that the probabilities of three groups of the number of typhoons (low, median and high) in a year 0.4, 0.5, and 0.1, respectively. Further, the study revealed the conditional probabilities of the SST above normal phase with the given condition of occu ences of the number of typhoons at three levels (see the table below). In one ye缸， it was observed that the SST was at its above normal phase. What are the probabilities of the occurrences of the number of typhoons at three levels? Comment upon the results. The number of typhoons Probability of SST above normal phase Low 0.3 Median 0.5 High 0.8
To develop the seasonal forecasting skill of extreme weathers, a study disclosed a relationship between the number of typhoons and the sea surface temperature (SST) in a specific region. In the study, the number of typhoons is grouped into low, median or high levels, and the SST can be categorized into three phases, above normal, normal and below normal. Using the historical records, the study found that the probabilities of three groups of the number of typhoons (low, median and high) in a year 0.4, 0.5, and 0.1, respectively. Further, the study revealed the conditional probabilities of the SST above normal phase with the given condition of occu ences of the number of typhoons at three levels (see the table below). In one ye缸， it was observed that the SST was at its above normal phase. What are the probabilities of the occurrences of the number of typhoons at three levels? Comment upon the results.
| The number of typhoons | Probability of SST above normal phase |
| Low | 0.3 |
| Median | 0.5 |
| High |
0.8
|
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