The correct statements out of the following statements: (A): Both the mean and standard deviation show an upward trend from 2000 on. (B): The mean but not the standard deviation, shows an upward trend from 2000 on. (C): The demand for electric power peaked in the second half of 2001 . (D): The standard deviation was larger in the second half of 2002 that in the second half of 1999 . (E): The mean of the monthly means in 2000 was lower than that for 2002 , but the standard deviation of the monthly means was higher. If the chart shows the approximate monthly means of the power grid frequency, in 1 1000 cycles per second, and 0.0 is the desired frequency of exact 60 cycles per second.

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Chapter 8.4, Problem 70E

To determine

The correct statements out of the following statements:

(A): Both the mean and standard deviation show an upward trend from 2000 on.

(B): The mean but not the standard deviation, shows an upward trend from 2000 on.

(C): The demand for electric power peaked in the second half of 2001.

(D): The standard deviation was larger in the second half of 2002 that in the second half of 1999.

(E): The mean of the monthly means in 2000 was lower than that for 2002, but the standard deviation of the monthly means was higher.

If the chart shows the approximate monthly means of the power grid frequency, in 11000 cycles per second, and 0.0 is the desired frequency of exact 60 cycles per second.

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