Whats the variance of variable X whose grouped FDT is given by X-values: xi 2 4 8
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Question:
What’s the variance of variable X whose grouped FDT is given by
X-values: xi 2 4 8 3 5 6
Frequencies: fi 2 3 0 1 1 2
(A) 3.5
(B) 1.5
(C) 2
(D) 4
(E) 3
(F) 7
In a stock market during one month, the mean price of stock α was $1, 500 with standard deviation $120 and the mean price for stock β were $50 with standard deviation $10. Which of the followings is true?
(A) Stock β has less variation.
(B) Stock α has more variation.
(C) Stock α is less risky.
(D) Both stocks have same variation.
(E) Nothing can be said about their variations.
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