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1. Where are the mean and
median located on a normal distribution.
2. Jay Olshansky from the
University of Chicago was quoted in Chance News as arguing that for the average
life expectancy to reach 100, 18% of people would have to live to 120. What standard deviation is he assuming for
this statement to make sense? (Assume
normal distribution.)
3. Cucumbers grown on a certain
farm have weights with a standard deviation of 2 ounces. What is the mean weight if 85% of the
cucumbers weigh less than 16 ounces?
(Assume normal distribution.)
4. If 75% of all families spend
more than $75 weekly for food, while 15% spend more than $150, what is the mean
weekly expenditure and what is the standard deviation? (Assume normal distribution.)
For
problems 225-228 consider the process of a drawing a card from a standard deck
and replacing it. Let A be drawing a
heart, B be drawing a king, and C be drawing a spade.
5. Are the events A and B disjoint? Explain.
6. Are the events A and B
independent? Explain.
7. Are the events A and C
disjoint? Explain.
8. Are the events A and C
independent? Explain.
9. Give me an example of two
events that are disjoint and independent.
10. What does the symbol È mean?
11. What does the symbol Ç mean?
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