Question

listed below are amounts of strontium 90 in millbecquerels or mbq in a simple random sample of baby teeth obtained from residents in a region born after 1979use the given data to construct a boxplot and identify the 5 number summary 121124126130132136139141143146150150151153154159161163167172

Answer 1

The five-number summary is the minimum, first quartile, median, third quartile, and maximum.

minimum: 121

maximum: 172

There are 20 data points, then to find the median we need to locate the 10th and 11th place and average them.

median: (146 + 150)/2 = 148

The first quartile is located at half of the first 10 terms, then we need to compute the average between the 5th and 6th terms.

first quartile, Q1: (132 + 136)/2 = 134

The third quartile is located at half of the last 10 terms, then we need to compute the average between the 15th and 16th terms.

third quartile, Q3: (154 + 159)/2 = 156.5

Now, we can graph the boxplot, as follows: