7) Your used car is expected to last an average of 200,000 miles with a standard deviation of 25,000 miles before it requires a new transmission. a. Use Chebyshev's theorem to approximate the probability that the engine will last between 150,000 miles and 250,000 miles. b. Assume a symmetric bell-shaped distribution to approximate the probability that the engine will last between 150,000 miles and 250,000 miles