The average of a collection of 20 measurements was calculated to tb 56 cm. But later it was found that a mistake had occurred in one of the measurement which was recorded as 64 cm., but should have been 61 cm. The correct average must be -

The average of a collection of 20 measurements was calculated to tb 56

1.	The average of a collection of 20 measurements was calculated to tb 56 cm. But later it was found that a mistake had occurred in one of the measurement which was recorded as 64 cm., but should have been 61 cm. The correct average must be -
A.	3 cm
B.	4.5 cm
C.	5.85 cm
D.	6.15 cm
Answer» D. 6.15 cm

Discussion

No Comment Found

Related MCQs

What is the average age of children in the class?_x000D_ I. _x000D_ The age of the teacher is as many years as the number of children._x000D_ II. _x000D_ Average age is increased by 1 year if the teacher's age is also included.
In a cricket team, the average age of eleven players in 28 years. What is the age of the captain? I. The captain is eleven years older than the youngest player. II. The average age of 10 players, other than the captain is 27.3 years. III. Leaving aside the captain and the youngest player, the average ages of three groups of three players each are 25 years, 28 years and 30 years respectively.
How many marks did Tarun secure in English? I. The average mark obtained by Tarun in four subjects including English is 60. II. The total marks obtained by him in English and Mathematics together are 170. III. The total marks obtained by him in Mathematics and Science together are 180.
How many candidates were interviewed everyday by the panel A out of the three panels A, B and C? I. The three panels on average interview 15 candidates every day. II. Out of a total of 45 candidates interviewed everyday by the three panels, the number of candidates interviewed by panel A is more by 2 than the candidates interviewed by panel c and is more by 1 than the candidates interviewed by panel B.
The average age of P, Q, R and S is 30 years. How old is R? I. The sum of ages of P and R is 60 years. II. S is 10 years younger than R.
The average of six numbers is 3.95. The average of two of them is 3.4, while the average of the other two is 3.85. The average of the remaining two numbers is :
The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. The average age of all the boys in the class becomes:
The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is :
Five years ago, the average age of P and Q was 25. The average age of P, Q and R today is 25. Age of R after 5 years will be :
The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included, the mean rises by 400 grams. Find the weight of the teacher (in kg.)

The average of a collection of 20 measurements was calculated to tb 56 cm. But later it was found that a mistake had occurred in one of the measurement which was recorded as 64 cm., but should have been 61 cm. The correct average must be -

Discussion

No Comment Found

Related MCQs

Reply to Comment