+0

# Ms. Thayer bought 6 items for her physics class at a mean cost of $8.40 per item. +1 33 2 +1063 Ms. Thayer bought 6 items for her physics class at a mean cost of 8.40 dollars per item. When she added a dial caliper for 46.50 dollars to her purchases, the new mean for all 7 items became about... Explain your thinking. Nov 9, 2020 ### 2+0 Answers #1 +93 +2 Hello GamemasterX40! This is my attempt of solving this problem: "Ms. Thayer bought 6 items for her physics class at a mean cost of 8.40 dollars per item. When she added a dial caliper for 46.50 dollars to her purchases, the new mean for all 7 items became about... Explain your thinking." SOLUTION (and explanation): We know that the mean is the average of a set of numbers. With this information in mind, we know that the total cost of the 6 items Ms Thayer bought for her class was: $6 \times 8.40 = 50.40 \text{ dollars.}$ Now, Ms. Thayer bought a 7th item, the dial caliper, for 46.50 dollars. Adding this to our total, we get$50.40+46.50 = 96.90 \text{ dollars.}\$ Again, we knot that the mean is the average of a set of numbers. That means the mean, or in the context of the problem, the average price, of the 7 objects is: $\frac{96.90}{7}=13.8428571429... \approx 13.84 \text{ dollars.}$

I hope this helped!

Nov 9, 2020
#2
+1063
+1

Thank you so much for clearing this up for me! I was a bit confused and had to make sure of my work.

GAMEMASTERX40  Nov 10, 2020