College students average 86 hours of sleep per night with a

Reference no: EM13613641

College students average 8.6 hours of sleep per night with a standard deviation of 35 minutes. If the amount of sleep is normally distributed, what proportion of college students sleep for more than 9.7 hours?

Probability = _______________

The lifetime of lightbulbs that are advertised to last for 3600 hours are normally distributed with a mean of 3700 hours and a standard deviation of 300 hours. What is the probability that a bulb lasts longer than the advertised figure?

Probability = ______________

Reference no: EM13613641

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