Test Details

Average

Navodaya

Jan 27, 8:00 PM

150 minutes

Jan 27, 10:30 PM

20.0 marks

MCQ

20 questions

Md Aslam Ansari

Hello students, I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit.

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Question Text

Question 1 :
In a colony, the mean age of all the males is $15$ years, and the mean age of all females is $19$ years. Find the condition that must be true about the mean age $m$ of the 
combined group of male and female in colony.

Question 2 :
The mean of a set of 10 numbers is 20 Is each number is first multiples by 2 and then increased by 5 then what is the mean of new numbers?

Question 3 :
The arithmetic mean of the cubes of first four natural numbers is

Question 4 :
$12, a, 6, 8, 2, 14$ The average (arithmetic mean) of the numbers listed above is $6$. Calculate the value of $a$.

Question 5 :
The A.M. of a set of $50$ numbers is $38$. If two numbers of the set, namely $55$ and $45$ are discarded, the A.M. of the remaining set of numbers is :

Question 6 :
Mean of $14, 17, 11, 13, 26, 21, 31$, and $19 $

Question 7 :
A boat costs $x$  dollars, and this cost is to be shared equally by a group of people. In terms of $x$, how many dollars less will each person contribute if there are $4$ people in the group instead of $3$?

Question 8 :
The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team?

Question 9 :
The arithmetic mean of the set of observations $1, 2, 3, ..., n$ is

Question 11 :
The average age of a group of eight is same as it was 3 years ago, when a young member is substituted for an old member the incoming member is younger to the outgoing member by

Question 13 :
The mean of $8, 7, 9, 10, 12, x$ and $14$ is $12$, then find the value of $x$.

Question 15 :
$2, 10, m, 12, 4$ A group of $5$ integers is shown above. If the average (arithmetic mean) of the numbers is equal to $m$, find the value of $m$.

Question 16 :
The average of $11, 12, 13, 14$ and x is $13$. The value of x is _____________.

Question 18 :
$12-n, 12, 12+n$ What is the average (arithmetic mean) of the $3$ quantities in the list above?

Question 19 :
The average of $33.5, 30.4, 25.6, 31.5\  and \ 29$ is:

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