Consider the relative frequency distribution given below: 
There were 60 numbers in the data set. How many numbers were in the interval 40-under 60?
Definitions:
Internal Jugular Veins
Large veins located in the neck that carry blood from the head back to the heart.
Subclavian Veins
Major veins located under the clavicle (collarbone) responsible for draining blood from the upper extremities back to the heart.
Brachiocephalic Veins
Large veins that receive blood from the head, neck, and upper limbs and transport it back to the heart.
Great Saphenous Vein
The Great Saphenous Vein is the longest vein in the human body, running along the length of the lower limb.
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