The word ‘‘text” (or ‘‘txt”) is contained in 7.01% of all messages, and in 38.55% of all spam messages. What is the probability that a message is spam, given that it contains the word ‘‘text” (or ‘‘txt”)?

Refer to a large collection of real SMS text messages from participating cellphone users.13 In this collection, 747 of the 5574 total messages (13.40%) are identified as spam.