Provide an appropriate response.
-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. What was the average cost of a pen?
A) $\$ 1.33$
B) $\$ 1.29$
C) $\$ 0.99$
D) $\$ 1.39$ 3 Approximate the Variance and Standard Deviation of a Variable from Grouped Data

Question

Quizplus · Accepted Answer

To find the average cost of a pen, first calculate the total cost of all pens and then divide by the total number of pens. The total cost is $5 \times 1.29 + 3 \times 1.49 + 6 \times 1.79 + 9 \times 0.99 = 6.45 + 4.47 + 10.74 + 8.91 = 30.57$. The total number of pens is $5 + 3 + 6 + 9 = 23$. The average cost per pen is $30.57 / 23 = 1.33$.

Provide an Appropriate Response $1.29\$ 1.29$1.29 Each, 3 Blue Pens At $1.49\$ 1.49$1.49

Provide an Appropriate Response $\$ 1.29$ Each, 3 Blue Pens At $\$ 1.49$