First slide

Introduction to statistics

Question

If the mean of first n natural numbers is $\frac{5 n}{9},$

Easy

A

5
B

4
C

9
D

none of these

Solution

It is given that
$\frac{1 + 2 + 3 + \dots + n}{n} = \frac{5 n}{9} \Rightarrow \frac{n + 1}{2} = \frac{5 n}{9} \Rightarrow n = 9$

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