The communications monitoring company Postini has reported that 91% of email messages

are spam. Suppose your inbox contains 25 messages.

What is the mean of the number of real messages you should expect to find in your inbox?

The mean of the number of real messages you should expect to find in your inbox is 22.75

Step-by-step explanation:

According to the given data we have the following:

reported spam email messages percenatge=91%

number of messages in inbox=25

Therefore, In order to calculate the mean of the number of real messages you should expect to find in your inbox we would have to use the following formula:

Mean (np) = number of messages in inbox*reported spam email messages percenatge10 * 0.6 = 6

Mean (np) = 25 * 0.91 = 22.75

The mean of the number of real messages you should expect to find in your inbox is 22.75