A company sends each customer an email and a text message. The events that a customer reads the two messages are modelled as independent. The probability of reading the email is 0.72, and the probability of reading neither message is 0.098.
Find the probability that a customer reads the text message.
Find the probability that exactly one message is read.
In a group of 800 customers, find the expected number who read at least one message.
Give one reason why the independence model may be unsuitable.