4. (9%) Mean Std. Dev Proportion overcharged 15 percent 3 percent 0.05 Do not touch the yellow content 4. 19%) An auditor has found that of a client company's customers have been overcharged. For those who have been overcharged, the percentage overcharged is well described by the normal distribution with mean of 15 and a standard deviation of In each question, display the Excel formulaud (a) Given that a customer is overcharged, what is the probability that the percent of customers who were overcharged was more than 101? Display 4 decimal places PlOvercharge>10%) HN/A b 30th percentile N/A (b) What is the 30th percentile of percent overcharged? C P[More than 3 overcharged) IN/A (c) 20 customers are randomly selected, what is the probability that more than 3 of them were overcharged? Display 4 decimal places