Suppose that a certain brand of light bulb has a mean life of 600 hours and a standard deviation of 53 hours.
A. A histogram of the data indicates the sample data follows a bell-shaped distribution. According to the Empirical Rule, 99.7% of light bulbs have lifetimes between and hours.
B. Assuming the data are bell shaped, determine the percentage of light bulbs that will have a life between 494 and 706 hours.
C. Assuming the data is bell shaped, what percentage of light bulbs will last between 547 and 706 hours.
D. Use Chebyshev's Inequality to determine the minimum percentage of light bulbs with a life within 2.5 standard deviations of the mean.
E. Use Chebyshev's Inequality to determine the number of light bulbs that will be within 3 standard deviations of the mean.