Question

The mean of seven observations  5,8,4,9,a,5,8 is 6 . What should be value of a.​

Answer 1

Answer:

a=3

Step-by-step explanation:

5+8+4+9-a+5+8/7=6

39+a/7=6

39+a=6*7

39+a=42

a=42-39

a=3

Answer 2

Answer: Here total number of observation is 7

So sum of all the seven observation is as follows

5+8+4+9+a+5+8=39+a

Mean = sum of observation /

number of observation

6=39+a/7

6*7 = 39 + a

42 = 39+a

42 - 39 = a

a = 3 ans