Leigh investigates the color of shells deposited on a beach as she walks along the coastline. She wants to know whether this var
iation in color is due to chance or if it is significant. Data was collected over a minimum 20 cm long region at four sites along the beach coast. Shells were categorized into four different shades, 1 being the lightest and 4 being the darkest. What is the mean number of shells collected?
