Mr Smith first tests dаta: 55,42,78,99,69,83,74,83,97. The median is labeled Q2 for the 2nd quartile. What is the Q2 for Mr. Smith's first test?

Sort the data from the smallest one.

42, 55, 69, 74, 78, 83, 83, 97, 99

There are 9 data, n = 9

Find the location of Q₂

Q₂ location = (n + 1) / 2

Q₂ location = (9 + 1) / 2

Q₂ location = 10/2

Q₂ location = 5

The location of Q₂ is in the fifth order

42 first order

55 second order

69 third order

74 fourth order

78 fifth order

etc

So the Q₂ or the median is 78