(c) What is the probability that the sample mean lifetime is between 1490 and 1550 hours? The probability that the sampl
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Lightbulbs: The lifetime of lightbulbs has a mean of 1500 hours and a standard deviation of 110 hours. A sample of 30 lightbulbs is tested. Use the Cumulative Normal Distribution Table or technology. Round your answers to four decimal places. Part 1 of 3 (a) What is the probability that the sample mean lifetime is greater than 1520 hours? The probability that the sample mean lifetime is greater than 1520 hours is 0520 Part 2 of 3 (b) What is the probability that the sample mean lifetime is less than 1540 hours? The probability that the sample mean lifetime is less than 1540 hours is Part: 2/3 Part 3 of 3 X X (c) What is the probablity that the sample mean lifetime is between 1490 and 1550 hours? The probability that the sample mean lifetime is between 1490 and 1550 hours O * 13