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If a light bulb has a mean of 1400 hours and a standard deviation of 100 hr what is the probability that the light bulb lasts between 1290 hours and 1530 hours?
Wiki User
∙ 6y ago
It is 0.2325
Wiki User
∙ 6y ago
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The Z Value, or Z Score, does not apply to the mean, it is a representation of a piece of data. z = (x-µ)/sigma
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The z-score can't be calculated with the information given. A mean & standard deviation is required to put into the formula: Z = (x-mean)/sigma. Your x value is 10.
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