Question

the mean of 15 observations is 14 .If the mean of first 70 observations is 12 and the last observations is 16 , then find the Middleton​

Answer 1

Step-by-step explanation:

Answer

⇒ It is given that Mean of 5 observations is 15.

∴ The sum of observations =15×5=75.

∴ It is given that mean of the first 3 observations is 14.

∴ The sum of first three observations =14×3=42.

⇒ Given that mean of the last 3 observations is 17.

∴ The sum of the last three observations =17×3=51

∴ The third observation =(42+51)−75

=93−75

=18

Answer 2

Answer:

Step-by-step explanation:

15x14 =216

12x7=84

16x7=102

add 84 and 102 =186

216-184=32 is the answer.

hope it will help u simply