The average cost of a pen is $1.33 and this can be determined by using the average formula and also by using the given data.
Given :
Jim buys his school supplies in bulk. on one particular shopping trip, he bought 5 red pens at $1.29 each, 3 blue pens at $1.49 each, 6 green pens at $1.79 each, and 9 black pens at $0.99 each.
The following steps can be used in order to determine the average cost of a pen:
Step 1 - First determine the total cost of 5 red pens.
[tex]=5\times 1.29[/tex]
= $6.45
Step 2 - The total cost of 3 blue pens is:
[tex]=3\times 1.49[/tex]
= $4.47
Step 3 - The total cost of 6 green pens is:
[tex]= 6 \times 1.79[/tex]
= $10.74
Step 4 - The total cost of 9 black pens is:
[tex]=9\times 0.99[/tex]
= $8.91
Step 5 - The average cost of a pen is given by:
[tex]=\dfrac{6.45+4.47+10.74+8.91}{5+3+6+9}[/tex]
[tex]= \dfrac{30.57}{23}[/tex]
= $1.33
For more information, refer to the link given below:
https://brainly.com/question/15570401
