If 10% ofhouseholds have incomes that are greater than a specified income level,

Question

If 10% ofhouseholds have incomes that are greater than a specified income level, X, then it can be concluded that A) X is the 5th percentile of the distribution of incomes B) X is the 10'th percentile of the distribution of incomes C) X is the 90'th percentile of the distribution of incomes D) X is the 95'th percentile of the distribution of incomes Questions 2 and 3 refer to the following summary of the 2015 federal income taxes paid by a random sample of 400 Virginia residents. The units are thousands of dollars. Smallest 25'th percentile Mediarn Mean 75'th percentile 0 1.5 6.5 10 100 Largest Which of the following statements is true concerning this sample of 400 Virginia residents? A) 50% of the residents paid more than $6500 B) 75% of the residents paid more than $10000 C) The range of this sample of data is $5000 50% of the residents paid less than $3000 D) E) All of the above are true 3. The shape of this sample of taxes paid is best described as (HINT: Think of what a boxplot would look like for this data.) B) slightly skewed to the left D) slightly skewed to the right A) substantially skewed to the left C) symmetric E) substantially skewed to the right Each child born to a particular set of parents has probability .25 of having blood type o. 4 If these parents have five children it is desired to find the probability that at most two of them will have blood type O. Using the binomial distribution, what set of values of n, , and X should be sed to find this probability? A) n-2, =25, X-2 B) n=5, -4, X-2 C) n=5, =.25, X=2 D) n=5, =25, X-0,1,2

Explanation / Answer

1) option C is correct ' X is the 90th percentile

2)option D is correct ( as median is at 3000 tehrefore 50% below and 50% above )

3)option E (as mean is greater than median)

4)option D is correct

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