Calculate the mean value.

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Representing Data Using Tally Marks

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Question

A

3.3

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B

3

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C

3.2

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D

3.1

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Solution

The correct option is A 3.3
We are given,

$\sum f_{i} x_{i} = 66$
$N = 20$

$M e a n (¯ x) = \frac{\sum f_{i} x_{i}}{N}$ = $\frac{66}{20}$ = $3.3$

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