3. A recent internal report issued by the marketing manager for a national oil change franchise indicated that the mean number of miles between oil changes for franchise customers is at least 360 KM. One Malaysia franchise owner conducted a study to determine whether the marketing manager's statement was accurate for his franchise's customers. He selected a sample of 10 customers and determined the number of miles each had driven the car between oil changes. The following sample data were obtained. 365 420 194 278 355 373 320 331 392 390 a. Obtain a sample mean and standard deviation. b. Perform an appropriate analysis to test the marketing manager claim at a: 0.05