7. A computer company that recently developed a new software product wanted to estimate the mean time taken to learn how to use this software by people who are somewhat familiar with computers. A random sample of 12 such persons was selected. The following data give the times taken (in hours) by these persons to learn how to use this software. 1.75 2.25 2.4 1.9 1.5 2.75 2.15 2.25 1.8 2.2 3.25 2.6 a. What is the point estimate of the population mean