A NUMMI assembly line, which has been operating since 1984, has built an average of 6,000 cars and trucks a week.

Generally, 10% of the cars were defective coming off the assembly line. Suppose we draw a random sample of n = 100 cars.

Let X represent the number of defective cars in the sample. What can we say about X in regard to the 68-95-99.7 empirical rule (one standard deviation, two standard deviations and three standard deviations from the mean are being referred to)?

Assume a normal distribution for the defective cars in the sample.