English Medium Class 9 - CBSE Question Bank Solutions

Describe some fundamental characteristics of statistics.

What is primary data?

What secondary data?

Which of the two – the primary or the secondary data – is more reliable and why?

Explain the meaning of the term Variable.

Explain the meaning of the term Class-integral.

Explain the meaning of the term Class-size.

Explain the meaning of the term Class-mark.

Explain the meaning of the term Class limits.

Explain the meaning of the term Frequency.

Explain the meaning of the term True class limits.

Define cumulative frequency distribution.

Explain the difference between a frequency distribution and a cumulative frequency distribution.

If \[x - \frac{1}{x} = - 1\]  find the value of  \[x^2 + \frac{1}{x^2}\]

Find the cube of the following binomials expression :

\[\frac{1}{x} + \frac{y}{3}\]

Find the cube of the following binomials expression :

\[\frac{3}{x} - \frac{2}{x^2}\]

Find the cube of the following binomials expression :

\[2x + \frac{3}{x}\]

Find the cube of the following binomials expression :

\[4 - \frac{1}{3x}\]

If a − b = 4 and ab = 21, find the value of a³ −b³