Question

The mean of first three observation is 15 and the mean is 15 and the mean of next two observation is 20 then fund the mean of all five observations

Answer 1

Answer:

Given information

• mean of three observations is -15
• mean of fourth and fifth observation is -20

Explanation:

solution

adding all observations

i.e 15+15+15+20+20=85/2=42.5

Answer 2

The mean of all five observations

Explanation:

• Mean of first three observation = 15
• Mean of next two observation  = 20
• Total observation = 5
• Mean of five observation = ?

• Hence,  $\frac{n_{1} +n_{2} +n_{3}}{3}=15$ and   $\frac{n_{4}+n_{5} }{2}= 20$

• x=$\frac{n_{1}+n_{2}+n_{3}+n_{4}+n_{5} }{5}$
• x=$\frac{45+40}{5}$
• x=17
• So the mean of all five observation is 17