Mean = ∑ f x∑ f\;\frac{\sum\;f\;x}{\sum\;f}∑f∑fx
= 35010\;\frac{350}{10}10350
= 35
= ∑ f ∣d∣∑ f\;\frac{\sum\;f\;|d|}{\sum\;f}∑f∑f∣d∣
= 9010\;\frac{90}{10}1090
= 9
