Question

what is the mean of observation x,2x+1,2x+5,2x+9 is 30 what is the mean of last it observation​

Answer 1

Answer:

hope the answer to your question in the above attachment helps you

Answer 2

GIVEN THAT

Mean of x , 2x +1 , 2x+5 , 2x + 9 is 30

( x+2x+1 +2x + 5 + 2x + 9 )/4 = 30

7x + 15 = 120

7x = 120- 15

7x = 105

x = 105 / 7

x = 15

NOW WHAT WE HAVE TO FIND? THE MEAN OF LAST HOW MANY OBSERVATIONS IT IS NOT MENTIONED IN THE QUESTION?