Hi Tommy
I've got a few statistics questions that I am not sure of and thought you might be able to help me.
Question 1)
A set of consecutive integers contain -4 and 6. However, -6 and 9 are not in the set.
Column A
The range of the set
Column B
13
Answer: D (I infer that the set could contain all integers starting with -5 and ending with 8, but not necessarily unless we are specifically told so)
Question 2)
An English class has a total of 100 scores whose mean is 72.5 and standard deviation is 4.7.
If to each score an additional 5 point increment is added, what is greater.
Column A
Standard deviation of the adjusted 100 scores.
Column B
5.2
Answer: B (my reasoning was that if we added an identical increment to each score, the standard deviation will not change, is this right?)
Question 3)
m<2
P = {1,2,3, m, 2m}
What could be the median of set P? Select all that apply.
A. 1
B. 2
C.3
D. m
E. 2m
Answer: A, B ? (This is an interesting question, not sure though; can I infer that m is an integer?)
Question 4)
Column A
The mean of all positive odd integers from 1 to 50 inclusive.
Column B
The mean of all positive even integers from 2 to 50 inclusive.
Answer: I dont know any fast route to the answer here, would you mind sharing a magic shortcut to solve this in no time? I tend to get stuck in this sort of questions.
your help would be most valuable.
- Maria