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  • Question
  • The average of 6 observation is 12. A new 7th observation is included and the new average is decrease by 1 , the seventh observation is?


  • Options
  • A. 1
  • B. 3
  • C. 5
  • D. 6

  • Correct Answer


  • Explanation

    Seventh observation = sum of 7 observations - sum of 6 observations = 7 x 11 ? 6 x 12
    = 5


  • Average problems


    Search Results


    • 1. 
      The average salary of 20 workers in an office id Rs. 1900 per month . If the manger's salary is added , the average salary become Rs. 2000 p.m what is the manager's annual salary?

    • Options
    • A. Rs. 24000
    • B. Rs. 25200
    • C. Rs. 45600
    • D. None of these
    • Discuss
    • 2. 
      The average expenditure of a man for the first five month is Rs. 120 and for the next seven months it is Rs . 130. if he saves Rs 299 in that year, his monthly average income is?

    • Options
    • A. Rs. 140
    • B. Rs. 150
    • C. Rs. 160
    • D. Rs. 170
    • Discuss
    • 3. 
      The average age of 24 students in a class is 10. If the teacher's age is included, the average increase by one . The age of the teacher is?

    • Options
    • A. 25 year
    • B. 30 year
    • C. 35 year
    • D. 40 year
    • Discuss
    • 4. 
      Average monthly income of a family of 4 earning members was Rs. 735. One of the earning members died and therefore, the average income came down to Rs 650. The income of the deceased was?

    • Options
    • A. Rs. 692.80
    • B. Rs. 820
    • C. Rs. 990
    • D. Rs. 1385
    • Discuss
    • 5. 
      In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 18 years is replaced by a new boy. The age of the new boy is?

    • Options
    • A. 14 years 8 months
    • B. 15 years
    • C. 16 years 4 months years
    • D. 17 years 10 months years
    • Discuss
    • 6. 
      Out of four number, the average of first three is 15 and that of the last three is 16, if the last number is 19, the first is?

    • Options
    • A. 15
    • B. 16
    • C. 18
    • D. 19
    • Discuss
    • 7. 
      The average temperature of the first three days is 27° C and that of the next three is 29° C . If the average of the whole week is 28.5° C, the temperature of the last day of the week is?

    • Options
    • A. 10.5° C
    • B. 21° C
    • C. 31.5° C
    • D. 42° C
    • Discuss
    • 8. 
      A ship sails out to a mark at the rate of 15 kmph. and sails back at the rate of 10 kmph. The average rate of sailing is?

    • Options
    • A. 5 km/hr
    • B. 12 km/hr
    • C. 12.5 km/hr
    • D. 25 km/hr
    • Discuss
    • 9. 
      The average consumption of petrol for a car for seven months is 110 litres and for next five months it is 86 litres. The average monthly consumption is?

    • Options
    • A. 96 litres
    • B. 98 litres
    • C. 100 litres
    • D. 102 litres
    • Discuss
    • 10. 
      A batsman has a certain average runs for 11 innings . In the 12th innings he made a score of 90 runs and thereby decrease his average by 5 . His average after 12th innings is?

    • Options
    • A. 127
    • B. 145
    • C. 150
    • D. 217
    • Discuss


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