What is the average for the following set of measurements?
27ºc, 12ºc, 31ºc, 19ºc, 23ºc, 11ºc, 17ºc

a. 140ºc
b. 28ºc
c. 7ºc
d. 20ºc

The correct answer is- D. 20ºC

Average can be described as a central value in the given set of observation  that can be mathematically calculated.

It is the sum total of all the values / set of measurements in a given data divided by the total number of observations.

Thus, for the given set of measurements, average is calculated as-

Average= [27⁰C+ 12⁰C+ 31⁰C + 19⁰C+ 23⁰C+ 11⁰C+  17⁰C] /7

= 20ºC