Question

The Mean of 5 obrevation is 19 .Find the fifth obrevation ,if the fourth obrevation are 16,18,15 and 12​

Answer 1

HEY MATE!

HERE IS YOUR ANSWER:

STEP BY STEP EXPLANATION:

LET 4TH OBSERVATION BE x

MEAN=

$\frac{sum \: of \: all\: observations}{total \: number \: of \: observations} \\ = \frac{16 + 18 + 15 + 12 + x}{5}$

SO, 19 ×5 = 61+x

95=61+x

95-61=x

34=x

Thus , 4th observation is 34

HOPE IT HELPED ^_^

Answer 2

sum of total number

= 16+18+15+12+x/5

=61+x/5

but mean of 5 observation is 19

therefore

61+x/5=19

61+x=95

x=95-61

x=34

so the fifth observation is 34