The probability that it will rain tomorrow is 0.85. What is the probability that it will not rain tomorrow?
Question:
The probability that it will rain tomorrow is 0.85. What is the probability that it will not rain tomorrow?
Solution:
Given: Probability that it will rain 
TO FIND: Probability that it will not rain
CALCULATION: We know that sum of probability of occurrence of an event and probability of non occurrence of an event is 1.
$P(E)+P(\bar{E})=1$
$0.85+P(\bar{E})=1$
$P(\bar{E})=1-0.85$
$P(\vec{E})=0.15$
Hence the probability that it will not rain is $=0.15$