Question

the mean of 5observaion is 19. Find the fifth observation sif four obrevation are 16,18,15and12.​

Answer 1

Answer:

Let the fifth observation be x

Given observations are 16, 18, 15, 12

Now, total observations are 16, 18, 15, 12, x

Given mean = 19

Apply formula of mean:

mean = Sum of observations/ Number of observations

19 = 16+18+15+12+x/5

19 = 61+x/5

19 multiply 5 = 61+x

95 = 61+x

95-61 = x

x=34

Thus, fifth observation is 34

Answer 2

Answer:

34

Step-by-step explanation:

Let the fifth observation be x

Mean =

$sum \: of \: observations \div number \: of \: observations$

=

$= 16 + 18 + 15 + 12 + x \div 5 = 19$

$61 + x \div 5 = 19$

$19 \times 5 = 61 + x$

$61 + x = 95$

$x = 95 - 61$

$x = 34$

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