Suppose a 60-watt light bulb produced by a company has a mean life of 750 hours with a standard deviation of 30 hours. If a random sample of 36 bulbs is selected, find the mean and the standard deviation of the sample mean. O The mean of the sample mean is 60. The standard deviation of the sample mean is 30 -S √16 O The mean of the sample mean is 30. O The standard deviation of the sample mean is 30.

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