# 7. The enrolment in a school during six consecutive years was as follows:         1555, 1670, 1750, 2013, 2540, 2820        Find the mean enrolment of the school for this period.

Given,

Enrolment during 6 consecutive years = $1555, 1670, 1750, 2013, 2540, 2820$

We know, Arithmetic mean

$=\frac{sum\ of\ observations}{number\ of\ observation}$

$\\ = \frac{1555+ 1670+ 1750+ 2013+ 2540+ 2820}{6} \\ = \frac{12348}{6} \\ \\ = 2058$

Therefore, mean enrolment per year is $2058$

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