**Hi, I cant figure out this question and I need help**
A manufacturer finds that the delivery times of a certain item to customers is normally distributed with a mean of 16 working days and a standard deviation of 2.5 working days. The manufacturer has given customers a guarantee of "delivery within 20 working days " what percentage of customers will receive their deliveries late?
** I don't understand wouldn't it be 0% since its only 2.5 days away from the mean making it 18.5 days? **
A manufacturer finds that the delivery times of a certain item to customers is normally distributed with a mean of 16 working days and a standard deviation of 2.5 working days. The manufacturer has given customers a guarantee of "delivery within 20 working days " what percentage of customers will receive their deliveries late?
** I don't understand wouldn't it be 0% since its only 2.5 days away from the mean making it 18.5 days? **