The weather is dreadful here. It rains on three times as many days as there are rain-free days. Luckily the daily weather forecast is fairly good. Whether the forecast is for rain or for no rain, it is correct on nine occasions out of ten. What is the probability that the weather forecast will predict rain tomorrow? The answer is 13/16, however I am unable to see how to arrive at this answer. Could someone please let me know of the working in order to recieve this asnwer? Thanks in advance.