Average resting heart rate is around 50

We have conducted many thousands of measurements of pulse and heart rate variability since 2010. The participants are completely ordinary people working in Norwegian companies. They are randomly distributed in relation to age, gender, weight and physical fitness.

There are several references to what we consider incorrect resting heart rate, such as:

http://www.mayoclinic.org/healthy-living/fitness/expert-answers/heart-rate/faq-20057979

60-100 is not typical in controlled conditions. Measurements taken at hospitals or doctor's offices often pertain to people who are stressed, sick, or both. It's not surprising that measurements in less controlled environments give higher resting heart rates in ordinary people. A person with an average resting pulse of 49 at night can drink coffee, climb stairs, and feel stressed and measure 65 in pulse. These factors have a significant impact on the measurement and make the recorded pulse artificially high and unsuitable as a basis for evaluating lifestyle issues.

Most of us greatly benefit from reducing our resting heart rate, whether it's from 55 to 52 or from 47 to 43. 

https://tidsskriftet.no/2012/06/oversiktsartikkel/hva-sier-hvilepulsen-om-helse-og-sykdom (In Norwegian)