Question

(b) Mean of 9 observations is 10. If eight of them are 6.5, 7, 7.7, 8.5, 10, 12.5, 14.5, 16.5 Find
the ninth observation.​

Answer 1

Ans 65

Step-by-step explanation:

(6.5+7++7.7+8.5+10+12.5+14.5+16.5+x)/9 = 16.5

(83.5+x)/9=16.5

83.5+x=16.5*9

83.5+x=148.5

x=148.5-83.5

x=65

Answer 2

Answer:

6.8

Step-by-step explanation:

• 10 * 9 = 90

• 6.5 + 7 + 7.7 + 8.5 + 10  + 12.5 + 14.5 + 16.5 = 83.2

• 90 - 83.2 = 6.8

Thus, 6.8 is the ninth observation .