An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed, with mean equal to 760 hours and standard deviation of 40 hours. Assume that a random sample of 16 bulbs has an average life of 780 hours.
Does this assumption prompt you to question the premise that μ=760 hours??
Since the random sample of 16 bulbs is said to have an average life of 780 hours, I thought of using normalpdf since it is not cdf.
Am I in the right track?
Does this assumption prompt you to question the premise that μ=760 hours??
Since the random sample of 16 bulbs is said to have an average life of 780 hours, I thought of using normalpdf since it is not cdf.
Am I in the right track?
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