The length of life (in hours) of a certain type of electric…
The length of life (in hours) of a certain type of electric bulb is a continuous random variable with a mean of 500 hours and a standard deviation of 35 hours. Draw the bell-shaped curve and label it. Use the central limit theorem to find the probability that a random sample of 49 bulbs will have a mean life between 488 and 505 hours.