Mathematics
Mathematics, 23.10.2019 08:50, garrismunoz

On average, indoor cats live to 16 years old with a standard deviation of 2.5 years. suppose that the distribution is normal. let x = the age at death of a randomly selected indoor cat. round answers to 4 decimal places where possible.

a. what is the distribution of x? x ~ n([],[])

b. find the probability that an indoor cat dies when it is between 17.2 and 19.6 years old.[]

c. the middle 20% of indoor cats' age of death lies between what two numbers?
low: [] years
high: [] years

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Mathematics, 31.10.2019 07:31, gatita70
The world health organization reports that the distribution of ages at time of death in the united states has a mean u of 79.8 years and a standard deviation ơ of 15.5 years, based on death certificates. the distribution of ages at time of death is obviously left-skewed (, few people die young and most die old). researchers plan to take a random sample of 100 american death certificates. (a) what are the mean and standard deviation of the sampling distribution of the mean age at death, x, for samples of 100 american death certificates? (enter your answer rounded to two decimal places.) mean: years standard deviation years (b) choose the correct explanation why the sampling distribution of is approximately normal o the sampling distribution of is approximately normal because the 100 death certificates represent a o the sampling distribution of is approximately normal because the 100 death certificates do not represent a the central limit theorem says that the sampling distribution of a mean does not have an approximately normal normal population. normal population. distribution even if the population is not norma the central limit theorem says that the sampling distribution of a mean has an approximately norm.l distribution even if the population is not normal, (as long as the sample size is large enough) scroll (c) what is the probability that the mean age at time of death in a random sample of 100 american death certificates will be less than 78 years? (enter your answer rounded to four decimal places.)
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