Question

If the mean of 5 observation are x, x.2, x.4, x.6, x.8 is 11. Find the mean of first 3 observation

Answer 1

here you go ☆☆

we know that,

▪$mean = \frac{total \: sum \: of \: observations}{total \: observations}$

▪$11 = \frac{x + 2 + x + 4 + x + 6 + x + 8 + x}{5}$

▪$55 = 5x + 20$

▪$55 - 20 = 5x$

▪$5x =3 5$

▪$x = 7$

so,

▪$<u>first observation = 7$

▪$<u> second observtion = 9$

▪$<u> third observation = 11$

:)

$\boxed{ \bold{hope \: it \: helps }}$