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  • Question
  • The mean of 100 observations is 40. It is found that an observation 84 was misread as 48. Then the correct mean is ?


  • Options
  • A. 40.36
  • B. 41.24
  • C. 41.92
  • D. 42.05

  • Correct Answer
  • 40.36 

    Explanation

    Given,

    mean of 100 observations is 40

    => Total of 100 observations = 40 x 100 = 4000

    84 is misread as 48

    => Difference = 84 - 48 = 36

    => Now, new total of 100 observations = 4000 + 36 = 4036

    Correct Mean = 4036/100 = 40.36


  • Average problems


    Search Results


    • 1. David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, Mathematics,Physics, Chemistry and Biology What are his average marks ?

    • Options
    • A. 75
    • B. 68
    • C. 65
    • D. 60
    • Discuss
    • 2. In a mens hostel, there were 95 students. To accommodate 30 more students the average is decreased by rupees 5. But total expenditure increased by Rs.500. Find the total expenditure of the hostel now ?

    • Options
    • A. Rs. 4680
    • B. Rs. 4420
    • C. Rs. 4960
    • D. Rs. 5480
    • Discuss
    • 3. The average price of three items of furniture is Rs. 15000. If their prices are in the ratio 3:5:7, the price of the cheapest item is :

    • Options
    • A. 6000
    • B. 7000
    • C. 8888
    • D. 9000
    • Discuss
    • 4. The average of 9 results is 50. The average of the first four results is 52 and the average of the last four results is 49. what is the fifth result?

    • Options
    • A. 48
    • B. 46
    • C. 52
    • D. 44
    • Discuss
    • 5. In a class of 78 students 41 are taking French, 22 are taking German. Of the students taking French or German, 9 are taking both courses. How many students are not enrolled in either course?

    • Options
    • A. 6
    • B. 12
    • C. 24
    • D. 18
    • Discuss
    • 6. Without any stoppage, a person travels a certain distance at an average speed of 42 km/h, and with stoppages he covers the same distance at an average speed of 28 km/h. How many minutes per hour does he stop?

    • Options
    • A. 15 minutes
    • B. 20 minutes
    • C. 18 minutes
    • D. 22 minutes
    • Discuss
    • 7. The average age of 7 boys is increased by 1 year when one of tem whose age is replaced by a girl. What is the age of the girl ?

    • Options
    • A. 33 yrs
    • B. 27 yrs
    • C. 21 yrs
    • D. 29 yrs
    • Discuss
    • 8. In Arun's opinion, his weight is greater than 65 kg but leas than 72 kg. His brother does not agree with Arun and he thinks that Arun's weight is greater than 60 kg but less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, what is the average of diferent probable weights of Arun ?

    • Options
    • A. 55.5 kg
    • B. 66.5 kg
    • C. 77.5 kg
    • D. 88.5 kg
    • Discuss
    • 9. The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students is 14 years and that of the other 9 students is 16 years, The age of the 15th student is :

    • Options
    • A. 11
    • B. 12
    • C. 13
    • D. 14
    • Discuss
    • 10. The ratio of speeds of a car, a train and a bus is 5:9:4. The average speed of the car, the bus and the train is 72 km/hr together. What is the average speed of the car and the train together ?

    • Options
    • A. 84 km/hr
    • B. 96 km/hr
    • C. 72 km/hr
    • D. 60 km/hr
    • Discuss


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