The watermelons grown on a farm have normally distributed weights, with a mean weight of 80.1 ounces and a standard deviation of 17.7 ounces. Which weight interval centered at the mean includes 50% of all the watermelons? A) [65.2, 95.0]
B) [68.2, 92.0]
C) [71.0, 89.2]
D) [74.0, 86.2]