Answer:
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
