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1. It is known that the population of students who take EconS 311 have a final grade that is normally distributed with µx = 81 and sx2 = 25.
a. For one observation (student) from this population, find Pr (X < 80).
Now suppose that a random sample of students is selected from this population. Note that the next two questions are about X‾, not about X itself.
b. In a random sample of size n = 64, find Pr (X < 80).
c. In a random sample of size n = 36, find Pr (78< X < 84).
d. Explain the central limit theorem in the context of the current problem, and indicate whether it was needed to find these probabilities in a, b, and c (might differ for each of a, b, and c).
Analyze the message delivered by each of your visual media items. Foreachitem, respond to the following questions in complete sentences. Cite evidence from the resource and the lesson to justify your responses.
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man wants to help provide college education for his daughter. He can afford to invest $600/yr for the next 4 years, beginning on the girl's 4th birthday, he wishes to give his daughter $4000 on her 18th 19th 20th and 21th birthdays, for a total of..
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