Daily wages of 80 workers: ₹200–250: 8, ₹250–300: 16, ₹300–350: 24, ₹350–400: 20, ₹400–450: 12. Using the step-deviation method, find the mean daily wage.
Competition practiceStatistics
A₹332.5
B₹317.5
C₹325.15
D₹330
Step-by-Step Solution
A=325,h=50,u=−2,−1,0,1,2:∑fu=−16−16+0+20+24=12. Mean =325+50×8012=332.5.
Answer: A) ₹332.5
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