It is estimated that 90% of senior citizens suffer from sleep disorders and 7% suffer from anxiety. Moreover, 6% of senior citizens suffer from both sleep disorders and anxiety.

(a) Find the probability that a senior citizen suffers from anxiety, given that he or she has sleep disorder. Round your answer to 2 decimal places.

(b) Given that a senior citizen suffers from anxiety, what is the probability that he or she also suffers from sleep disorder? Round your answer to 2 decimal places.