10 Suppose it is known the average American family of four w

10. Suppose it is known the average American family of four washes 2000 pounds of clothes a year. Assume the variable is normally distributed with a standard deviation of 187.5 pounds. Suppose a sample of 50 families is taken. Find two values (in pounds) so that the middle 99.9% of sample means would fall between them. (HINT: You are looking for values of x instead of x, but. the process is similar. To get started, record the symbol that goes with each of the number given in the problem.)

Solution