每日一题

Mathematics

A weather forecaster is examining data about the weather in a specific city. The table above shows the average number of days in a particular season that were either clear, partly cloudy, or cloudy. Based on the table, if a day in spring is randomly selected which of the following is closest to the probability that it was either partly cloudy or cloudy?

A.16%
B.22%
C.27%
D.44%

答案和解析

答案：D

解析：

Choice D is correct. The goal is to find the probability that a day in spring was either partly cloudy or cloudy. Written as a ratio, the probability is

Probability=(#of days in the spring that were partly cloudy or cloudy)/(of days in spring)

Since the number of days in the spring that were partly cloudy is 25, the number of days in the spring that were cloudy is 15, and the total number of days in spring is 91,

Probability=(25+15)/91=0.439

Multiplying 0.439 by 100 gives approximately 44%.