- A69.43
- B76.43
- C138.86
- D62.43
Step-by-Step Solution
Class marks: 50,60,70,80,90. ui=-2,-1,0,1,2. fi*ui = 3*-2+10*-1+11*0+8*1+3*2 = -6-10+0+8+6 = -2. sum fi = 35. Mean .
Answer: A) 69.43
The literacy rate (%) of 35 districts is grouped as:
45-55: 3, 55-65: 10, 65-75: 11, 75-85: 8, 85-95: 3.
Find the mean literacy rate using the step-deviation method (take a = 70, h = 10).
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