The monthly expenditures on food by single adults living in one neighborhood of Los Angeles are normally distributed with a mean of $370 and a standard deviation of $100. Suppose a sample of 12 adults was taken. The middle 50% of the sample mean or average monthly expenditure by the selected 12 adults are between what two values? Round to two decimal places.     $302.55 and $437.45     $350.53 and $389.47     $350.53 and $375.62     $364.38 and $375.62

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.