Weather forecast for July in Chongqing

Because the probability of rain on the 5th is 0.2, and the probability of rain on the 6th is 0.4.

So the probability of no rain on the 5th is 0.8, and the probability of no rain on the 6th is 0.6.

So the probability that it won't rain in the final exam is 0.8× 0.6 = 0.48.

So choose B.