Question

What is the first quartile, Q1, of the data represented by the box plot?

Answer 1

Statistical file:
{12.5, 20, 65, 143.75}

Quartile Q1: 16.25
Quartile Q2: 42.5
Quartile Q3: 104.375

Answer 2

The correct answer is 12.5

A boxplot is a statistical instrument that is used for showing graphically how a dataset is distributed by representing its quantiles.

The quantiles are three points which divide the data set in four equal-size subgroups, with the same number of observations in each. The first quantile is located in 12.5 hence, the first division of the dataset contains observations that range from 0 to 12.5.