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9-01-2019 S1

Question

5 students of a class have an average height 150 cm and variance $18 \mathrm{~cm}^2$. A new student, whose height is 156 cm , joined them. The variance (in $\mathrm{cm}^2$ ) of the height of these six students is

Select the correct option:

A

18

B

20

C

22

D

16

✓ Correct! Well done.

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