3. Over the past several months, an adult patient has been treated for tetany (severe muscle spasms). This condition is associated with an average total calcium level below 6 mg/dl. Recently, the patient's total calcium tests gave the following readings (in mg/dl:9.7 8.6 10.7 8.9 9.4 9.8 10.0 9.9 11.2 12.1. ). Assume that the population of x values has an approximately normal distribution nl for the population mean of