The accompanying data contains the monthly retail sales ($ millions) of a large country's women's clothing stores for 70 months

The accompanying data contains the monthly retail sales ($ millions) of a large country's women's clothing stores for 70 months. A sample taken from this population to estimate the average sales in this time period is shown below.

2.339 3.059 2.992 2.663 2.949 2.391 2.433 2,597 2,440 2,603 3,082 3,98 2,396 2,510 2,9633,194 2,537 2,426 3,173 3,160 2,482 3,050 2,476 2,771 3,153 2,409 3,116 2,530 2,702 3,024 2,625 3,141 3,082 3,134 2,957 3,195 2,458 2,737 2,960 2,837 2,667 2,578 2,369 2,805 3,139 2,853 3,091 3,043 2,875 2,614 2,909 2,979 2,874 ,378 2,864 3,018 2,922 2,560 2,721 2,879 2,485 3,113 3,105 2,627 3,188 3,152 2,354 2,473 2,764 3,210

a. Calculate the population mean. (Round to two decimal places as needed.)

b. Calculate the sample mean. (Round to two decimal places as needed.)

c. How much sampling error is present in this sample? (Round to two decimal places as needed.)