Question

The mean of the given frequency distribution is:

x	30	20
f	15	5

विकल्प

• \[\frac{30}{15}+\frac{20}{5}\]

• \[\frac{30}{15}-\frac{20}{5}\]

• \[\frac{550}{20}=27.5\]

• \[\frac{50}{20}=2 \cdot 5\]

Answer 1

\[{\boldsymbol{\frac{550}{20}=27.5}}\]

Explanation:

x	f	fx
30	15	450
20	5	100
Total	Σf = 20	Σfx = 550

By formula, \[\text{Mean} = \frac{\Sigma fx}{\Sigma f} = \frac{550}{20} = 27.5\]