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Author Question: The life expectancy in the United States is 75 with a standard deviation of 7 years. A random sample ... (Read 178 times)

P68T

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on: Jun 24, 2018
The life expectancy in the United States is 75 with a standard deviation of 7 years. A random sample of 49 individuals is selected.
 a. What is the probability that the sample mean will be larger than 77 years?
  b. What is the probability that the sample mean will be less than 72.7 years?
  c. What is the probability that the sample mean will be between 73.5 and 76 years?
  d. What is the probability that the sample mean will be between 72 and 74 years?
  e. What is the probability that the sample mean will be larger than 73.46 years?

Question 2

A standard normal distribution is a normal distribution with _____.
 a. a mean of 1 and a standard deviation of 0
  b. a mean of 0 and a standard deviation of 1
  c. any mean and a standard deviation of 1
  d. any mean and any standard deviation


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Dinolord

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Reply #1 on: Jun 24, 2018
Answer to Question 1

a. .0228
b. .0107
c. .7745
d. .1573
e. .9382

Answer to Question 2

b


P68T

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Reply 2 on: Jun 24, 2018
Great answer, keep it coming :)

peter

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Reply 3 on: Yesterday
Wow, this really help

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