The correct statements out of the following statements: (A): The power grid frequency was at or below the mean until late 1999 . (B): The power grid frequency, was more stable in mid- 1999 than in 1995 . (C): The power grid frequency, was more stable in mid- 2002 than in 1999 . (D): The greatest fluctuations in the power grid frequency occurred in 2000 − 2001 . (E): The power grid frequency was more stable around January 1995 than around January 1999 . If the chart shows the approximate standard deviation of the power grid frequency, in 1 1000 cycles per second, for over 6 -month periods and 0.9 is the average standard deviation.

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Chapter 8.4, Problem 69E

To determine

The correct statements out of the following statements:

(A): The power grid frequency was at or below the mean until late 1999.

(B): The power grid frequency, was more stable in mid-1999 than in 1995.

(C): The power grid frequency, was more stable in mid-2002 than in 1999.

(D): The greatest fluctuations in the power grid frequency occurred in 2000−2001.

(E): The power grid frequency was more stable around January 1995 than around January 1999.

If the chart shows the approximate standard deviation of the power grid frequency, in 11000 cycles per second, for over 6-month periods and 0.9 is the average standard deviation.

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