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s6 The arithmetic mean of the series is 30.5. Find the missing figure.40501082010X:20157

Answer»

Let the missing value be x. Mean = sum of all values / sum of frequency of every value.=> 30.5 = [ 10*8 + 20*10 +x*20 + 40*15+50*7] / (8+10+20+15+7)=> 30.5 = [1230+20x] / 60=> 1830 = 1230+20x=> 600= 20x=> x = 30.

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