find the mean of the following data in assumed mean 20-60=7, 60-100=5,100=150=16,150-250=12,250-350=2,350-450=3
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Answer:
189.4
Step-by-step explanation:
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CI f x d fd
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20 - 60 7 40 - 160 -1120
60 - 100 5 80 - 120 -600
100 - 150 16 125 - 75 -1200
150 - 250 12 200=a 0 0
250 - 350 2 300 100 200
350 - 450 3 400 200 600
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£f = 45 £fd= - 2120
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a= 200
mean = a + £fd / £f
= 200 +( - 2120/200)
= 200 - 10.60
= 189.4
mean of the above data= 189.4
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