A) \[6.25\]
B) \[6.75\]
C) \[6.27\]
D) \[6.42\]
Correct Answer: C
Solution :
Arithmetic mean \[=\frac{{{x}_{1}}{{f}_{1}}+{{x}_{2}}{{f}_{2}}+.....+{{x}_{n}}{{f}_{n}}}{{{f}_{1}}+{{f}_{2}}+.....+{{f}_{n}}}\] \[=\frac{(7\times 2)+(2\times 3)+(9\times 6)+(5\times 4)}{2+3+6+4}\] \[=\frac{14+6+54+20}{15}=\frac{94}{15}=6.27\]
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