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Data Handling

The following data : 2, 5, 15, 25, 20, 12, 8, 7, 6, 16, 21, 17, 30, 32, 23, 40, 51, 15, 2, 9, 57, 19, 25 is grouped in the classes 0 –5, 5 –10, 10 –15 etc. Find the frequency of the class 20 –25.

(a) 5 (b) 4 (c) 3 (d) 2

Data Handling

The range of the data– 9, 8, 4, 3, 2, 1, 6, 4, 8, 10, 12, 15, 4, 3 is

(a) 15 (b) 14 (c) 12 (d) 10

Rational Numbers

Find the sum of additive inverse and multiplicative inverse of 7.

Rational Numbers

From a rope 40 metres long, pieces of equal size are cut. If the length
of one piece is 10/3 metre, find the number of such pieces.

Rational Numbers

Find two rational numbers whose absolute value is 1/5 .

Rational Numbers

Find five rational numbers between 0 and 1.

Rational Numbers

Can you find a rational number whose multiplicative inverse is –1?

Rational Numbers

The product of two rational numbers is –7. If one of the number
is –5, find the other?

Rational Numbers

If 16 shirts of equal size can be made out of 24m of cloth, how much
cloth is needed for making one shirt?

Rational Numbers

Give one example each to show that the rational numbers are closed
under addition, subtraction and multiplication. Are rational numbers
closed under division? Give two examples in support of your answer.