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NDA 2016

Exam: NDA
Year: 2016
Subject: Mathematics
Chapter: Statistics

NDA 2016 · Mathematics · Statistics

A random sample of 20 people is classified in the following table...

A random sample of 20 people is classified in the following table according to their ages:
What is the mean age of this group of people?

Options

A $41.0$
B $41.5$
C $42.0$
D $42.5$

Correct answer

B. $41.5$

Step-by-step solution

\Rightarrow Mean age

=\frac{\Sigma x_i f_i}{\Sigma f_i}=\frac{836}{20}=41.5

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