The given double bar graph shows the sale of mobile phones and cars from $2005$ to $2008$.

(i) Find the ratio of the total number of
mobile phones sold in $2006$ and $2008$
to the total number of cars sold in
$2005$ and $2007$
(ii) What is the average number of cars
sold from $2005$ to $2008$?

Which of the following is false?

Which of the following is true?

Average of the marks in maths of 40 students in a class was 74. The mean of marks for boys was 72, while their number was 21. The mean of marks of girls in the class was

One of $26$ letter keys on a type writer is pressed. What is the probability that the key prints a letter other than a vowel?

Find the arithmetic mean between $-5 \& 5$.

In a bag, there are seven cards numbered $1$ to $7$. A card is picked at random. What is the probability of picking not a prime number card? 

The average of five numbers is $35$. If mean of three of these numbers is $37$, what is the mean of the other two numbers?

Match the following: