3.118 A survey on the best Asian tourist destinations showed that, out of 70 people, 23 ranked Singapore as first, whereas 15 put Hong Kong in first place, 11 put Shanghai first, 7 put Beijing first, and the rest of them chose Tokyo. On the basis of this data, calculate the following.

a. The probability of the preferred destination being a city in China. (In this specific case, Hong Kong is not considered part of China.)

b. The probability of the preferred destination not being a Chinese city. (In this case, Hong Kong is considered a Chinese city, even if outside China.)

c. The probability of the preferred destination being Tokyo.

d. The probability of the preferred destination not being Singapore.