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. What is the mean weight of the 20 backpacks? The mean weight is pounds.

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.

Mean weight of the 20 backpacks = Total sum of observations divided by total number of observations

Combined Mean =

                            =

Therefore, the mean weight of the 20 backpacks is 11.

its a trick question

step-by-step explanation:

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