I think it is going to be 3.55 for each notebook and 1.9 for each pen
<h2>
Answer:</h2>
The probability is:

<h2>
Step-by-step explanation:</h2>
It is given that:
An urn contains balls numbered 1 through 20.
A ball is chosen, returned to the urn, and a second ball is chosen.
This means that this is a case of a replacement.
Hence, one of the event is independent of the other.
Now we know that the probability to get a particular number of ball is:

( Since, there are total 20 balls and a ball of one particular number is just unique )
i.e. 
Hence, the probability that the first and second balls will be a 8 is:

The answer to your question is d. 0.75 pounds
In order to construct a scatter plot, the essential items include;
A: The variable measured on the vertical axis. This is because the variables on both axes is the major reason why the graph is being constructed, so the variable must be identified.
B: The variable measured on the horizontal axis, for the same reason as stated above.
D: The scale of vertical and horizontal axes. This helps to read off the range of the data set without going beyond the limit