Answer:
B
Step-by-step explanation:
Hope it helps
The product of denominators can always serve as the common denominator. The appropriate choice is ...
... z times u . . . . . . . the first choice
Answer:
11
Step-by-step explanation:
Given:
A collection of 8 backpacks has a mean weight of 14 pounds
A different collection of 12 backpacks has a mean weight of 9 pounds
Question asked:
What is the mean weight of the 20 backpacks ?
Solution:
For first collection of backpacks.
As we know:
For Second collection of backpacks.
Now, we will find the mean weight of the 20 backpacks altogether.
<u>Mean weight of the 20 backpacks = Total sum of observations divided by total number of observations</u>
Combined Mean =
=
Therefore, the mean weight of the 20 backpacks is 11.