Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 57 hours and a standard deviation of 3.5 hours. With this information, answer the followir questions. a) What proportion of light bulbs will last more than 61 hours? (b) What proportion of light bulbs will last 50 hours or less? (c) What proportion of light bulbs will last between 58 and 61 hours? d) What is the probability that a randomly selected light bulb lasts less than 45 hours? a) The proportion of light bulbs that last more than 61 hours is Round to four decimal places as needed.)

Q: Assume that women's heights are normally distrubuted with a mean of 63.6 inches and a standard…

A: From the given information, the mean is 63.6 and the standard deviation is 2.5.

Q: A nurse supervisor has found that staff nurses, on the average, complete a certain task in 10…

A: Given μ=10σ=3

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A:

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A:

Q: 1) The time until recharge for a battery in a smartphone is normally distributed with a mean of 250…

A: a. Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

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A:

Q: The time needed to complete a final examination in a particular college course is normally…

A: μ=80 minutesσ=10 minutes

Q: The mean television viewing time for Americans is 20 hours per week. Suppose a sample of 30…

A:

Q: Suppose that the number of gallons of milk sold per day at a local supermarket are normally…

A: Let X denote the number of gallons of milk sold per day. X ~ N(424.7,460.9609)

Q: For women aged 18-24, systolic blood pressures are normally distributed with a mean of 114.8 mm Hg…

A:

Q: The time college students spend on the Internet follows a Normal distribution. At Johnson…

A: Given,mean(μ)=5standard deviation(σ)=1.2sample size(n)=100

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A: Let a random sample of 5year old oak tree is selected. Let x be the no. of oak trees Given…

Q: The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation…

A: Given Information:Population mean = 268 daysPopulation standard deviation = 15 days

Q: Suppose that among salmon fish that are longer than 80cm, their weights have a mean of 6.4kg and a…

A: Given information: μFish=6.4, σFish=0.50 n = 120