Exploring data: Graphs and numerical summaries
Exploring data: Graphs and numerical summaries

This free course is available to start right now. Review the full course description and key learning outcomes and create an account and enrol if you want a free statement of participation.

Free course

Exploring data: Graphs and numerical summaries

1.4.3.1 Beta endorphin concentration (collapsed runners)

The final column of Table 4 contains the blood plasma β endorphin concentrations for eleven runners who collapsed towards the end of the Great North Run. The observations are already sorted. They are as follows.

66 72 79 84 102 110 123 144 162 169 414

Eleven is an odd number, so the middle value of the data set is the sixth value (five either side). So, in this case, the sample median is 110 pmol/l.

M248_1

Take your learning further

Making the decision to study can be a big step, which is why you'll want a trusted University. The Open University has over 40 years’ experience delivering flexible learning and 170,000 students are studying with us right now. Take a look at all Open University courses.

If you are new to university level study, find out more about the types of qualifications we offer, including our entry level Access courses and Certificates.

Not ready for University study then browse over 900 free courses on OpenLearn and sign up to our newsletter to hear about new free courses as they are released.

Every year, thousands of students decide to study with The Open University. With over 120 qualifications, we’ve got the right course for you.

Request an Open University prospectus