the mean of 6 observation is 15. four of the observation are 10,18,23 and 9. of the remaining two observation one is four times the other. find them
Answers
Answer:
The mean of 10 observations = 15.3
The sum of the 10 observations = 10×15.3=153
If observations 6 and 9 are replaced by 8 and 14 respectively, then the new sum of 10 observations.
=153−(6+9)+8+14
=153−15+22
=160
So the new mean of 10 observations =10160
=16
Step-by-step explanation:
Find a polynomial that represents the total surface area of the rectangular solid shown in figure.

A
4x2−30x
B
2x2+30x
C
x2+10x
D
4x2+30x
Answer:
The remaining two observations are 6 and 24.
Step-by-step explanation:
Given that:
The mean of 6 observation is 15.
Four of the observation are 10, 18, 23 and 9.
The remaining two observation one is four times the other.
To Find:
What are the remaining two observations?
Let us assume:
Let the one observation be x.
Other observation = 4x
Formula used:
Mean = (Sum of observations)/(Number of observations)
Finding the remaining two observations:
According to the question.
⟶ 15 = (10 + 18 + 23 + 9 + x + 4x)/6
Cross multiplication.
⟶ 10 + 18 + 23 + 9 + x + 4x = 15 × 6
⟶ 60 + 5x = 90
⟶ 5x = 90 - 60
⟶ 5x = 30
⟶ x = 30/5
⟶ x = 6
Remaining observations are:
One observation = x = 6
Other observation = 4x = (4 × 6) = 24