In a study of life expectancy in a certain region, the mean age at death was 70 years, and the standard deviation was 5 years. The life expectancy (years) is assumed to follow a skewed distribution. Suppose that a random sample of 45 people from this region is selected.

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Q: Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 56…

A: The provided information is  µ=56 σ=3.3 P(X>60) a.P(X-µσ>60-563.3)=P(z>1.21)=0.1131   (from…

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A: Given that.   X~N( μ , ?^2 )   μ=80     , ?=12   Z-score =( x - μ )/?

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Q: Suppose that during any hour in a large department store, the average number of shoppers is 448,…

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A: Given, μ=70σ=5.1n=50

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A: Solution: Note: Hello! As you have posted 2 different questions, we are answering the first…

Q: Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of 56…

A: Since you have posted multiple question, we only provide answers of first three subparts . Please…

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Q: The monthly utility bills in a city are normally​ distributed, with a mean of ​$100 and a standard…

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Q: Suppose that the lifetimes of light bulbs are approximately normally​ distributed, with a mean of 56…

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Q: The monthly utility bills in a city are normally​ distributed, with a mean of ​$100 and a standard…

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Q: A set of final examination grades in an introductory statistics course is normally​ distributed,…

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Q: The monthly utility bills in a city are normally​ distributed, with a mean of ​$100 and a standard…

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