The following data represent the pH of rain for a random sample of 12 rain dates. a normal probability plot suggest the data could come from a population that is normally distributed. a boxplot indicates there are no outline. Determine a point estimate for the population mean. 5.20, 5.02, 4.87, 5.72, 4.57, 4.76, 4.99, 4.74, 4.56, 4.80, 5.19, 4.68.