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Data Analysis Data Analysis Basics Getting to Know Your Data Getting Friendly with Data

Michelle Rosenstock
PLUS
Michelle Rosenstock
Courses Plus Student 3,256 Points

Why answer B is wrong Quick Question 2 on Median

Hi, please advise how I get to the right answer. I added 10+8/2=9. 9 is between 8 and 10. How do I know which of these to select? thank you.

2 Answers

Jennifer Nordell
seal-mask
STAFF
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Jennifer Nordell
Treehouse Teacher

Hi there, Michelle Rosenstock ! I had originally posted an answer, which was correct, but didn't actually address your question properly. Because you specified problem 2 and these are given in random order, I just went from the information in your question. My apologies :smiley:

Now, to your actual question. Yes 9 is between 8 and 10, but you're not accounting for how many of there are of everything. There are thirty As, 10 Bs, 8 C's and 2 D's. A median is found at the midpoint of a sorted list. So let's do that. Let's see what that looks like:

A A A A A A A A A A A A A A A A A A A A A A A A A A A A A A B B B B B B B B B B C C C C C C C C D D

There are 50 grades total. The median will be at the halfway point which will be whatever resides at the twenty-fifth spot. So one more time with the 25th letter pointed out.

A A A A A A A A A A A A A A A A A A A A A A A A  > A <  A A A A A B B B B B B B B B B C C C C C C C C D D

// The midpoint is the one in > < or the twenty-fifth spot

As you can see, the grade residing at the midpoint of that sorted list is an "A".

Hope this helps! :sparkles:

Michelle Rosenstock
PLUS
Michelle Rosenstock
Courses Plus Student 3,256 Points

Hi Jennifer, apologies for the belated response. Thank you so much, I really appreciate your thorough and clarifying answer.