Compute coefficient of mean deviation from AM for the following series C.I 0-10 10-20 20-30 30-40 40-50
F 6 28 51 11 4
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Answer:0.28698
Explanation:X-mid- values-5 15 25 35 45
frequency-6 28 51 11 4∑f=100
fx-30 420 1275 385 180 ∑fx=2290
|xi-mean|=17.9 7.9 2.1 12.1 22.1
f|xi-mean|=107.4 221.2 107.1 133.1 88.4 ∑f|xi-mean|=657.2
mean deviation about mean=∑f|xi-mean|÷∑f=657.2÷100=6.572
co-efficient of mean deviation from mean=mean deviation÷mean=6.572÷22.9=0.2869
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