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Which of the following statement(s) is/are TRUE? A: Standard deviation = ∑δ2/n B: Harmonic mean of three numbers ‘a’, ‘b’ and ‘c’ is 3 abc/(a + b + c). C: Cumulative frequency is the total of a frequency and all frequencies so far in a frequency distribution.

Which of the following statement(s) is/are TRUE? A: Standard deviation = ∑δ2/n B: Harmonic mean of three numbers ‘a’, ‘b’ and ‘c’ is 3 abc/(a + b + c). C: Cumulative frequency is the total of a frequency and all frequencies so far in a frequency distribution. Correct Answer Only C

GIVEN:

Three statements

CONCEPT:

Concept of standard deviation, harmonic mean, and cumulative frequency.

FORMULA USED:

Standard deviation = √(∑δ2/n)

Harmonic mean of three numbers ‘a’, ‘b’ and ‘c’ is 3 abc/(ab + bc + ac).

CALCULATION:

A: Standard deviation = √(∑δ2/n)

B: Harmonic mean of three numbers ‘a’, ‘b’ and ‘c’ is 3 abc/(ab + bc + ac).

C: Cumulative frequency is the total of a frequency and all frequencies so far in a frequency distribution.

Hence, Only C is TRUE.

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