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Find 'mean' and 'mode' of the following data :
begin{tabular}{|l|c|c|c|c|c|c|}
hline Class & 15-20 & 20-25 & 25-30 & 30-35 & 35-40 & 40-45
hline Frequency & 6 & 16 & 17 & 4 & 5 & 2
hline
end{tabular}
begin{tabular}{|l|c|c|c|c|c|c|}
hline Class & 15-20 & 20-25 & 25-30 & 30-35 & 35-40 & 40-45
hline Frequency & 6 & 16 & 17 & 4 & 5 & 2
hline
end{tabular}
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Solution: Correct table [1 1/2 marks]
Mean $= 27.5 - (\frac{8}{50} \times 5) = 26.7$ [1 + 1/2 marks]
Modal class is $25 - 30$
Mode $= 25 + 5 \times \frac{17 - 16}{34 - 16 - 4} = 25.36$ [1 1/2 + 1/2 marks]
Mean $= 27.5 - (\frac{8}{50} \times 5) = 26.7$ [1 + 1/2 marks]
Modal class is $25 - 30$
Mode $= 25 + 5 \times \frac{17 - 16}{34 - 16 - 4} = 25.36$ [1 1/2 + 1/2 marks]