The average age of residents in a large residential retirement community is 69 years with standard deviation 5.8 years. A simple random sample of 100 residents is to be selected, and the sample mean...

Help!!

Extracted text: The average age of residents in a large residential retirement community is 69 years with standard deviation 5.8 years. A simple random sample of 100 residents is to be selected, and the sample mean age x of these residents is to be computed. The probability that the average age, x, of the 100 residents selected is less than 68.5 years is: 0.568. 0.043. 0.805. 0.195.