Question

find the mean of 4,6,7,9 and 4

Answer 1

Mean=sum of observations /no of observations
=4+6+7+9+4/5
=30/5
=6

Answer 2

$\frac{4 + 6 + 7 + 9 + 4}{5} \\ \frac{30}{5} \\ = 6$