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Question

:

D

Mean=1×5+2×4+3×6+4×f15+f

i.e.,3=5+8+18+4f15+f⇒45+3f=31+4f

⇒45−31=f⇒f=14

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Consider the frequency distribution of the given number

Value:1234Frequency:546f

If the mean is known to be 3, then the value of f is

Value:1234Frequency:546f

If the mean is known to be 3, then the value of f is

**Answer: Option D**

:

D

Mean=1×5+2×4+3×6+4×f15+f

i.e.,3=5+8+18+4f15+f⇒45+3f=31+4f

⇒45−31=f⇒f=14

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