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Number of units of electricity consumed in a month by 68 households of a Vijayawada colony:
65-85: 4, 85-105: 5, 105-125: 13, 125-145: 20, 145-165: 14, 165-185: 8, 185-205: 4.
Find the mean consumption, correct to two decimal places.

Class 10Mean of Grouped DataStatistics and Probability
  • A127.06
  • B147.06
  • C1331.43
  • D137.06

Step-by-Step Solution

Class marks 75, 95, 115, 135, 155, 175, 195 give with , so the mean is units. "127.06" uses the lower limits as (each is 10 too small); "147.06" uses the upper limits; "1331.43" divides by 7, the number of classes.
Answer: D) 137.06

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