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.

Answers (1)

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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